-5x^2=-162

Solution for -5x^2=-162 equation:

-5x^2=-162

We move all terms to the left:

-5x^2-(-162)=0

We add all the numbers together, and all the variables

-5x^2+162=0

a = -5; b = 0; c = +162;
Δ = b2-4ac
Δ = 02-4·(-5)·162
Δ = 3240
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:

$\sqrt{\Delta}=\sqrt{3240}=\sqrt{324*10}=\sqrt{324}*\sqrt{10}=18\sqrt{10}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-18\sqrt{10}}{2*-5}=\frac{0-18\sqrt{10}}{-10}
=-\frac{18\sqrt{10}}{-10}
=-\frac{9\sqrt{10}}{-5}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+18\sqrt{10}}{2*-5}=\frac{0+18\sqrt{10}}{-10}
=\frac{18\sqrt{10}}{-10}
=\frac{9\sqrt{10}}{-5}
$