Question

The function f(x) = -2x2 + 12x + 32 models the approximate height of an object t seconds after it is launched. How many seconds does it take the object to hit the ground?

Answer 1

when f(x) = 0

Answer 2

solve
-2x^2+12x+32 = 0

Answer 3

i dont know how

Answer 4

@DanJS

Answer 5

Is it 8 seconds ??

Answer 6

divide both sides by -2

x^2 - 6x - 8 = 0

factor
(x-8)(x+2)=0

x=8 or x=-2

x is a time, so it must be positive

x= 8 seconds