6x-3x2=-12

Solution for 6x-3x2=-12 equation:

6x-3x^2=-12

We move all terms to the left:

6x-3x^2-(-12)=0

We add all the numbers together, and all the variables

-3x^2+6x+12=0

a = -3; b = 6; c = +12;
Δ = b2-4ac
Δ = 62-4·(-3)·12
Δ = 180
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:

$\sqrt{\Delta}=\sqrt{180}=\sqrt{36*5}=\sqrt{36}*\sqrt{5}=6\sqrt{5}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-6\sqrt{5}}{2*-3}=\frac{-6-6\sqrt{5}}{-6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+6\sqrt{5}}{2*-3}=\frac{-6+6\sqrt{5}}{-6}
$