H=-16t2+120t

Solution for H=-16t2+120t equation:

=-16H^2+120H

We move all terms to the left:

-(-16H^2+120H)=0

We get rid of parentheses

16H^2-120H=0

a = 16; b = -120; c = 0;
Δ = b2-4ac
Δ = -1202-4·16·0
Δ = 14400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{14400}=120$
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-120)-120}{2*16}=\frac{0}{32}
=0
$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-120)+120}{2*16}=\frac{240}{32}
=7+1/2
$