Sujet: parabolas liste de sujets
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	A common tangent to two general parabolas		2015-11-15
		Kind pose la question : Hi, I want to find the common tangent of two general parabolas, but i don't know if it's possible or not. If it's possible, please make a tutorial. The first parabola equation : Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0. The second parabola equation : Gx^2 + Hxy + Iy^2 + Jx + Ky + L = 0. I need this because i want to find the equation of Beloch fold. (Huzita - Hatori 6th axiom) However if you know any other method to find Beloch folds equation, I am open for any suggestions. Chris Fisher lui répond.
	A parabola		2012-06-04
		Madeline pose la question : In a parabola, I need to know what "a" b and c determine. I think that a determines the width of the parabola, but I am not exactly sure what b, and c do. Robert Dawson lui répond.
	Sketch the graphs of the following		2010-03-02
		musaf pose la question : without detailed plotting of points,sketch the graphs of the following showing relevant information on the graphs: a) y=(x-3)2 +5 b)y=4x-x2 Penny Nom lui répond.
	Graphing a parabola		2009-01-27
		Kimberly pose la question : I need help with this parabola: graph y=5x^2-5x-6. I am not really understanding how to graph parabolas in general. Can you help me? Penny Nom lui répond.
	x = y^2 and x = -4 y^2		2007-09-11
		Jil pose la question : My question is when dealing with parabolas, x=y^2, so that they are sifted on their side you could say, what will happen to the graph if you change it to x=-4y^2. I understand that the - flips the graph in the other direction but can you simply just plug in numbers and increase the stretch of the y? Penny Nom lui répond.
	Parabolas in the real world		2007-05-18
		Katherine pose la question : Hi, my name is Katherine, and my mean old math teacher just assigned us a test in which we have to write two examples of how parabolas are used in the real world, each one page single spaced, size 12!! I know you have already answered some questions like this, but I still don't understand the whole baseball thing, and any other way parabolas are used. And how I can write a whole page on it. But that's my problem, not yours, I just need help with a little explanation on how parabolas are actually used today. I know this might be kind of confusing for you, but imagine how it is for me!! Stephen La Rocque lui répond.
	Conic sections		2006-11-19
		Joyce pose la question : My son has a project on conic sections. I need the following information on Parabola, Circle, ellipse,and hyperbola. He can't find the following information for each conic section: equations with explanations, four uses for each shape and Shape explanation. Penny Nom lui répond.
	A fountain of water jets forms parabolic arches		2006-05-03
		Jennifer pose la question : Let's say in you have a fountain and the water jets form parabolic arches. The center of the fountain, being the origin of the coordinate system, it is elevated 5 feet off the ground, . The equation formed the water arch is y= -x2+4x, what is the radius of the basin needed to catch the water at ground level? Stephen La Rocque lui répond.
	Three parabolas		2004-04-24
		A tutor pose la question : I am a maths tutor. One of my year 12 students has given me this assignment. Many parts are ambiguous. I am trying to determine the equation of the line segment AB. Given that A has an incline of 10 degrees below the horizontal, I am assuming that this parabola (although you can only see part of it) has been rotated 10 degree clockwise. Am I right in assuming this? If so, how do I derive the equation of the parabola as it will then not fit the general form y = ax squared +bx +c of a parabola. Also, how is one expected to find the x coordinate of D without the equation of this parabola. To find the equation you need the x-coordinate and therefore be able to find another point on the parabola in order to derive the equation using simultaneous equations. Penny Nom lui répond.
	A parabola		2003-10-24
		Delores pose la question : Given the vertex (4, -2) y intercept = -6 find if/where the parabola crosses the x axis? Penny Nom lui répond.
	A circle, tangent to two circles and a line		2003-04-30
		Keith pose la question : I have a horizontal line (that is treated as a datum line or the X axis), with two circles having their center points at different heights from that line (X1,Y1 & X2,Y2). The two circles are also at different diameters (R1 & R2). Both circles and the line (X-Axis) do not intersect nor are they tangent. My goal is to determine the maximum diameter of an inscribed circle that will fit between all three. Chris Fisher and Harley Weston lui répond.
	Uses of conic sections		2003-04-01
		William pose la question : My name is William and I am doing a research paper on conic sections for my 12th grade math class. Part of the project is to find two conic sections in our world today and explain what there purpose is. I really need help in this area because I've been searching the internet for where conic sections are used in our world today and I really can't find anything. If you can tell me specific building or a pyramid that contains conic sections that would be great. Or even something in the universe would be helpful. Leeanne Boehm lui répond.
	The intersection of conics		2002-12-19
		Glenda pose la question : We are studying systems of equations where two conic sections are the two equations that we are solving simultaneously. We were studying the number of solutions that are possible if you have an ellipse and a parabola. We all agree that there can be none, one, two, three or four solutions. The question that the students had for me was whether or not a portion of an ellipse and a parabola can overlap and thereby allow an infinite number of solutions. What should I tell them? Chris Fisher and Harley Weston lui répond.
	How do you estimate the equation of a parabola?		2002-12-01
		Audrey pose la question : How do you estimate the equation of a parabola? I have a project where a must find parabolas in magazines and then estimate their equation. Penny Nom lui répond.
	Determining a parabola		2002-11-06
		Shelley pose la question : let (0,3) and (1,9)and (-1,1) be given points in a parablola. Determine a b and c Penny Nom lui répond.
	Parabolas		2002-02-03
		Kuang pose la question : -Who is credited for working with or studying the Parabola? -What is a conic section? -What does a parabola look like? -How is a parabola formed? -Where and how are parabolas used today in the real world? Harley Weston lui répond.
	Quadratics		2001-05-16
		John pose la question : I am in the final stages of a math project and I need to interview an expert for the last part. Please try to answer at least a few of these questions. How do you use quadratic equations in your everyday life? Do you find being a math expert very helpful in life? Is the quadratic equation useful to you? Why did you decide to become a math expert? What do you think is the most important function of the quadratic equation? Harley Weston lui répond.
	Circles, ellipses, parabolas and hyperbolas		2001-05-09
		Colleen pose la question : How is an ellipse like a circle? In what way does an ellipse have a center? How is a hyperbola similar and different to an ellipse? How is a parabola similar a different to a circle ellipse and parabola? Pnny Nom lui répond.
	A suspension bridge		2001-03-24
		Janna pose la question : The cables of a suspension bridge hang in a curve which approximates a parabola. The road bed passed through the vertex. If the supporting towers are 720m apart and 60m high, find: a) an equation of the parabola (it's y = 1/2160x2) b)the height of the cables at a point 30m from the vertex. I substituted 30 in for the x value and got 0.42 and the answer is 42. What did I do wrong? Denis Hanson and Claude Tardif lui répond.
	The path of a cannonball		2001-01-15
		A student pose la question : Artillerymen on a hillside are trying to hit a target behind a mountain on the other side of a river. Their cannon is at (x, y) = (3, 250) where x is in kilometers and y is in meters. The target is at (x, y) = (-2, 50). In order to avoid hitting the mountain on the other side of the river, the projectile from the cannon must go through the point (x, y) = (-1, 410). Write the equation for the problem. Penny Nom lui répond.
	Parabolas in life		2000-12-03
		Ashley pose la question : I am a student and my teacher recently gave us the assignment of writing a portfolio on parabolas in life and finding examples, three to be in fact, only we have to go into detail about only one. We have been instructed to include such terms as: axis of symmetry, completing the square, parabola, quadratic formula, standard form (vertex form) and vertex. We also must include in our detailed example an equation of the parabola and very specific details, PLEASE HELP! Harley Weston lui répond.
	Bridges and parabolas		2000-11-18
		Lauren pose la question : My name is Lauren, and Im a secondary school student in Ontario. For my gr11 advanced math class I have to find out how and why parabolics are used in arch bridges and write 3 paragraphs on it. People who cohse satelites and whatnot are lucky - I've found a ton of info, but for arch bridges there seems to be nothing. Harley Weston lui répond.
	A parabola problem		2000-03-23
		Morin pose la question : I need to prove that if parabola x2=4py has a chord (not necessarily a focal chord) intersecting it at points A and B, with tangents to the parabola at points A and B that intersect at C, then a line drawn through C and the midpoint of the chord M is parallel to the y-axis. Further, prove that the point D where this line intersects the parabola is the midpoint of line CM. Penny Nom lui répond.
	The Terror Run		2000-03-18
		Danny Mclean pose la question : A fairground's most popular attraction is a roller coaster ride known as the Terror Run. One stretch of track is called the Missile Path and is in the form of a parabolic curve. B is 180m horizontally from A and the highest point of the curve is 100m above A and B. A.. The owner works out a quadratic expression to describe the Missile Path. What is the expression He found? B.. A safety Engineer examined the structure and observed that points A and B were likely to be damaged due to the steepness of the Missile path near these points. The owner can see no way to make the Missile path less steep near A and B and to keep the height of the ride the same. HOW CAN IT BE DONE? Harley Weston lui répond.
	Parabolic shapes		1999-05-04
		Justin Ailor pose la question : Can you give me some parabolic shapes? Penny Nom lui répond.
	Satellite dishes		1999-02-10
		Katherine Shaw pose la question : I have read your information on 'Why are satellite dishes parabolic", and I know the reciever should be placed at the focus of the parabola. Could you test this with lights beams and a parabolic mirror, or would light beams behave differently. Thanks. Jack LeSage and Harley Weston lui répond.
	The Left Side of a Parabola.		1998-10-20
		Shay pose la question : Find the parametrized equation for the left half of the parabola with the equation: Y=x^2-4x+3 Chris Fisher lui répond.
	Parabolas		1998-07-24
		Danica pose la question : how do you find the focus, vertex, and directrix of 4x-y^2-2y-33=0 Penny Nom lui répond.
	Polynomials		1997-10-07
		Sheryl and Jeff pose la question : I'm a math teacher in Jerusalem, Israel. I'm teaching about graphing polynomial functions in a pre-calc class. A student asked me what they're good for. I couldn't give her a good example. Do you have one. Thanks. Penny Nom lui répond.
	The General Equation of a Parabola		1997-05-28
		Michelle pose la question : My name is Michelle and I am a 10th grade student in algebra 2 w/ analysis. I am doing a report on parabolas and I need to know what the general equation is. I've looked in books and keep finding different ones! I also need to know how they can be used in nature. Thank you so much for your time. I really appreciate it! - Michelle Harley Weston lui répond.
	Parabolic Mirrors		1997-01-28
		Megan Wennberg pose la question : Consider a ray of light that passes through a chord of a parabola (the chord is above the focus and parallel to the directrix), hits the parabola at a point (x,y) and is reflected through the focus. If d1 is the distance from the chord to the point of incidence (x,y) and d2 is the distance from (x,y) to the focus, can you prove that the sum of the distances d1+d2 is constant, independent of the particular point of incidence. Penny Nom lui répond.

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