H(t)=-16t^2-8t+120

Solution for H(t)=-16t^2-8t+120 equation:

(H)=-16H^2-8H+120

We move all terms to the left:

(H)-(-16H^2-8H+120)=0

We get rid of parentheses

16H^2+8H+H-120=0

We add all the numbers together, and all the variables

16H^2+9H-120=0

a = 16; b = 9; c = -120;
Δ = b2-4ac
Δ = 92-4·16·(-120)
Δ = 7761
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-\sqrt{7761}}{2*16}=\frac{-9-\sqrt{7761}}{32}
$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{7761}}{2*16}=\frac{-9+\sqrt{7761}}{32}
$