-3x2=8x-12

Solution for -3x2=8x-12 equation:

-3x^2=8x-12

We move all terms to the left:

-3x^2-(8x-12)=0

We get rid of parentheses

-3x^2-8x+12=0

a = -3; b = -8; c = +12;
Δ = b2-4ac
Δ = -82-4·(-3)·12
Δ = 208
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{208}=\sqrt{16*13}=\sqrt{16}*\sqrt{13}=4\sqrt{13}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-4\sqrt{13}}{2*-3}=\frac{8-4\sqrt{13}}{-6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+4\sqrt{13}}{2*-3}=\frac{8+4\sqrt{13}}{-6}
$