3(x^2-1)=36

Solution for 3(x^2-1)=36 equation:

Simplifying
3(x2 + -1) = 36

Reorder the terms:
3(-1 + x2) = 36
(-1 * 3 + x2 * 3) = 36
(-3 + 3x2) = 36

Solving
-3 + 3x2 = 36

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 3x2 = 36 + 3

Combine like terms: -3 + 3 = 0
0 + 3x2 = 36 + 3
3x2 = 36 + 3

Combine like terms: 36 + 3 = 39
3x2 = 39

Divide each side by '3'.
x2 = 13

Simplifying
x2 = 13

Take the square root of each side:
x = {-3.605551275, 3.605551275}