225=3x*x

Solution for 225=3x*x equation:

Simplifying
225 = 3x * x

Multiply x * x
225 = 3x2

Solving
225 = 3x2

Solving for variable 'x'.

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

Add '-3x2' to each side of the equation.
225 + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
225 + -3x2 = 0

Add '-225' to each side of the equation.
225 + -225 + -3x2 = 0 + -225

Combine like terms: 225 + -225 = 0
0 + -3x2 = 0 + -225
-3x2 = 0 + -225

Combine like terms: 0 + -225 = -225
-3x2 = -225

Divide each side by '-3'.
x2 = 75

Simplifying
x2 = 75

Take the square root of each side:
x = {-8.660254038, 8.660254038}