36x^2-81=-9

Solution for 36x^2-81=-9 equation:

Simplifying
36x2 + -81 = -9

Reorder the terms:
-81 + 36x2 = -9

Solving
-81 + 36x2 = -9

Solving for variable 'x'.

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

Add '81' to each side of the equation.
-81 + 81 + 36x2 = -9 + 81

Combine like terms: -81 + 81 = 0
0 + 36x2 = -9 + 81
36x2 = -9 + 81

Combine like terms: -9 + 81 = 72
36x2 = 72

Divide each side by '36'.
x2 = 2

Simplifying
x2 = 2

Take the square root of each side:
x = {-1.414213562, 1.414213562}