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do you know the equation of a parabola in "vertex form" ?
is it (x-h)^2? i kind of forget
look in your notes
ok hold on
y = a(x-h)^2 + k
My answer choice are: 18 m 32 m 46 m 4 m I was thinking I could approximate at 32m...
where (h,k) is the vertex (in this case the "top" of the parabola) next do you have a picture ? with any luck you could sketch it. it would look like this |dw:1439209730473:dw|
actually the turning point, or vertex is at the origin
the reason to study math is to practice "thinking". (or "puzzle things out" if you like) we can draw the picture any way we like. if we use my picture, what are the coordinates of the vertex?
if you put those numbers into the equation what do we get ?
y = a(x-h)^2 + k y = a(x-0)^2 + 50
for my problem the equation would simplify to y = a(x)^2 right?
ok and x-0 can be simplified to x, so y= ax^2 + 50 next, notice we are told the width (at ground level ) is 10 and with the origin at the middle, one side is at (5,0) put those numbers in for x and y and "solve for a"
**y = a(x)^2 right?*** you mean y= a x^2 + 50
i was saying for my equation...
with the parable i am supposed to be working with. just making sure i am understanding.
also trying to show that i am understanding what you are saying
let's use my picture, then we will go back and use your picture.
ok got it
y = ax^2 + 50 0 = a(5)^2 + 50
0 = 25a + 50 -50 = 25a -2 = a
yes, so the equation is y= -2 x^2 + 50 next we have to interpret **vertical clearance 2 m from the edge *** all the way to the edge is 5 meters. if we move 2 m to the left, what x value is that ?
now we use x=3 in the equation and find y. y will be the vertical height
y= -2 x^2 + 50 y = -2 (3)^2 + 50 y = -2 (9) + 50 y = -18 + 50 y = 32
oh lol so if this was the parabola in the equation the answer would be 32? I think this is also the same for my parabola because we have the same dimensions. I will check
looks like your guess way up top was a good one. if we draw the parabola with the vertex at (0,0), it looks like this |dw:1439210510774:dw|
haha ok thanks
please give me a medal @saseal
yes, we will get the same answer. with the origin at the vertex, the equation is y= a x^2 now we put in the point (5,-50) and solve for a -50= a*5*5 a= -2 y= -2 x^2
next, we put in x=3 to find y y= -2 *3*3 y= -2*9= -18 now we have to be careful. that is not the height. that is the distance down from the vertex the height above the "bottom" at y= -50 is the difference between -18 and -50