A projectile 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? Show your work for full credit.

Question

anonymous · Answer

Well they're basically asking for the vertex since this a quaadratic in the form 
y=-ax^2+bx+c but in this case there is no c on ax^2 and b 

A graph of a parabola with a being positive looks like this |dw:1374374823688:dw|
And a grpah of a parabola with a negative a, (-a) is |dw:1374374871218:dw|