x2-36=-9-2x2

Solution for x2-36=-9-2x2 equation:

x2-36=-9-2x^2

We move all terms to the left:

x2-36-(-9-2x^2)=0

We add all the numbers together, and all the variables

x^2-(-9-2x^2)-36=0

We get rid of parentheses

x^2+2x^2+9-36=0

We add all the numbers together, and all the variables

3x^2-27=0

a = 3; b = 0; c = -27;
Δ = b2-4ac
Δ = 02-4·3·(-27)
Δ = 324
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{324}=18$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-18}{2*3}=\frac{-18}{6}
=-3
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+18}{2*3}=\frac{18}{6}
=3
$