@Directrix You throw a ball straight up from a rooftop. The ball misses the rooftop on its way down and eventually strikes the ground. A mathematical model can be used to describe the relationship for the ball's height above the ground, y, after x seconds. Consider the following data:

x, seconds after ball is thrown y, ball's height, in feet, above the ground
1 114
2 146
4 114

Find the quadratic function y = ax2 +bx + c whose graph passes through the given points.
A. y = -12x2 + 80x + 46
B. y = -10x2 + 60x + 64
C. y = -16x2 + 100x + 30
D. y = -16x2 + 80x + 50

Question

@Directrix  You throw a ball straight up from a rooftop. The ball misses the rooftop on its way down and eventually strikes the ground. A mathematical model can be used to describe the relationship for the ball's height above the ground, y, after x seconds. Consider the following data:

 x, seconds after ball is thrown 	y, ball's height, in feet, above the ground
1 	114
2 	146
4 	114

Find the quadratic function y = ax2 +bx + c whose graph passes through the given points.
	A. y = -12x2 + 80x + 46 	
	B. y = -10x2 + 60x + 64 	
	C. y = -16x2 + 100x + 30 	
	D. y = -16x2 + 80x + 50

yacoub1993 · Answer

@Directrix how can i solve this one?

directrix · Answer

Let's check out this working of the problem which appears to be the same problem. http://openstudy.com/study#/updates/52074637e4b01dd6868a8e1f

yacoub1993 · Answer

ok

directrix · Answer

I agree with the reasoning for option D. @Yacoub1993 

Do you?

yacoub1993 · Answer

Yes after solving yes

directrix · Answer

Alrighty, then.