15x^2-84-36=0

Solution for 15x^2-84-36=0 equation:

Simplifying
15x2 + -84 + -36 = 0

Reorder the terms:
-84 + -36 + 15x2 = 0

Combine like terms: -84 + -36 = -120
-120 + 15x2 = 0

Solving
-120 + 15x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '120' to each side of the equation.
-120 + 120 + 15x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 15x2 = 0 + 120
15x2 = 0 + 120

Combine like terms: 0 + 120 = 120
15x2 = 120

Divide each side by '15'.
x2 = 8

Simplifying
x2 = 8

Take the square root of each side:
x = {-2.828427125, 2.828427125}