The height of a soccer ball that is kicked from the ground can be approximated by the function:
y = -14x2 + 70x
where y is the height of the soccer ball in feet x seconds after it is kicked.
What is the soccer ball's maximum height in feet?

87.5

Step-by-step explanation:

By completing the square,

y

=-14x^2+70x

=-14(x^2-5x)

=-14(x-5/2)^2+175/2

the max. height=175/2

i.e. 87.5

what are the options? ?

step-by-step explanation:

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1