X^2+8*x=768

Solution for X^2+8*x=768 equation:

X^2+8X=768

We move all terms to the left:

X^2+8X-(768)=0

a = 1; b = 8; c = -768;
Δ = b2-4ac
Δ = 82-4·1·(-768)
Δ = 3136
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{3136}=56$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-56}{2*1}=\frac{-64}{2}
=-32
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+56}{2*1}=\frac{48}{2}
=24
$