H=-16t^2+75t

Solution for H=-16t^2+75t equation:

=-16H^2+75H

We move all terms to the left:

-(-16H^2+75H)=0

We get rid of parentheses

16H^2-75H=0

a = 16; b = -75; c = 0;
Δ = b2-4ac
Δ = -752-4·16·0
Δ = 5625
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{5625}=75$
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-75)-75}{2*16}=\frac{0}{32}
=0
$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-75)+75}{2*16}=\frac{150}{32}
=4+11/16
$