Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?
Ireally need subtract and simplify.(-y^2 β 4y - 8) β (-4y^2 β 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.