-2x^2=-168

Solution for -2x^2=-168 equation:

-2x^2=-168

We move all terms to the left:

-2x^2-(-168)=0

We add all the numbers together, and all the variables

-2x^2+168=0

a = -2; b = 0; c = +168;
Δ = b2-4ac
Δ = 02-4·(-2)·168
Δ = 1344
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:

$\sqrt{\Delta}=\sqrt{1344}=\sqrt{64*21}=\sqrt{64}*\sqrt{21}=8\sqrt{21}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8\sqrt{21}}{2*-2}=\frac{0-8\sqrt{21}}{-4}
=-\frac{8\sqrt{21}}{-4}
=-\frac{2\sqrt{21}}{-1}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8\sqrt{21}}{2*-2}=\frac{0+8\sqrt{21}}{-4}
=\frac{8\sqrt{21}}{-4}
=\frac{2\sqrt{21}}{-1}
$