H=-3d(d-8)

Solution for H=-3d(d-8) equation:

=-3H(H-8)

We move all terms to the left:

-(-3H(H-8))=0


We calculate terms in parentheses: -(-3H(H-8)), so:

-3H(H-8)

We multiply parentheses

-3H^2+24H

Back to the equation:

-(-3H^2+24H)


We get rid of parentheses

3H^2-24H=0

a = 3; b = -24; c = 0;
Δ = b2-4ac
Δ = -242-4·3·0
Δ = 576
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{576}=24$
$H_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-24)-24}{2*3}=\frac{0}{6}
=0
$
$H_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-24)+24}{2*3}=\frac{48}{6}
=8
$