15=8h*8h-2h

Solution for 15=8h*8h-2h equation:

15=8h*8h-2h

We move all terms to the left:

15-(8h*8h-2h)=0

We add all the numbers together, and all the variables

-(-2h+8h*8h)+15=0

We get rid of parentheses

2h-8h*8h+15=0

Wy multiply elements

-64h^2+2h+15=0

a = -64; b = 2; c = +15;
Δ = b2-4ac
Δ = 22-4·(-64)·15
Δ = 3844
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{3844}=62$
$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-62}{2*-64}=\frac{-64}{-128}
=1/2
$
$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+62}{2*-64}=\frac{60}{-128}
=-15/32
$