-x^2=-6x-4

Solution for -x^2=-6x-4 equation:

-x^2=-6x-4

We move all terms to the left:

-x^2-(-6x-4)=0

We add all the numbers together, and all the variables

-1x^2-(-6x-4)=0

We get rid of parentheses

-1x^2+6x+4=0

a = -1; b = 6; c = +4;
Δ = b2-4ac
Δ = 62-4·(-1)·4
Δ = 52
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:

$\sqrt{\Delta}=\sqrt{52}=\sqrt{4*13}=\sqrt{4}*\sqrt{13}=2\sqrt{13}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-2\sqrt{13}}{2*-1}=\frac{-6-2\sqrt{13}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+2\sqrt{13}}{2*-1}=\frac{-6+2\sqrt{13}}{-2}
$