h=2+11t-5t ^2 find all values of t for which the height is 7 meters.

Answer 1

Jose,

You need to set h=7 and then solve the resulting quadratic equation for t.

Answer 2

h(t) = -5t² + 11t + 2

Set h(t)=7 and solve for t.

-5t² + 11t + 2 = 7

-5t² + 11t - 5 = 0

Now solve this last equation for t using the quadratic formula and finish from here.