H(t)=72t-16t2

Solution for H(t)=72t-16t2 equation:

(H)=72H-16H^2

We move all terms to the left:

(H)-(72H-16H^2)=0

We get rid of parentheses

16H^2-72H+H=0

We add all the numbers together, and all the variables

16H^2-71H=0

a = 16; b = -71; c = 0;
Δ = b2-4ac
Δ = -712-4·16·0
Δ = 5041
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{5041}=71$
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-71)-71}{2*16}=\frac{0}{32}
=0
$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-71)+71}{2*16}=\frac{142}{32}
=4+7/16
$