Quadratic Equations

Question

The path of a projectile launched from a 16 foot tall tower is modeled by the equation y=16x^2×64x+16. How long did it take to reach the maximum height?

Answer 1

=-b/(2a) = -64/(2*16) =- 64/32 = -2

16x^2 + 64x + 16

16( x^2 + 4x ) + 16 =

16(x^2 + 4x + 4) + 16 - 64 =

16(x+2)^2 - 48

I think your signs are wrong