300=x(3x)

Solution for 300=x(3x) equation:

Simplifying
300 = x(3x)

Remove parenthesis around (3x)
300 = x * 3x

Reorder the terms for easier multiplication:
300 = 3x * x

Multiply x * x
300 = 3x2

Solving
300 = 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.
300 + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
300 + -3x2 = 0

Add '-300' to each side of the equation.
300 + -300 + -3x2 = 0 + -300

Combine like terms: 300 + -300 = 0
0 + -3x2 = 0 + -300
-3x2 = 0 + -300

Combine like terms: 0 + -300 = -300
-3x2 = -300

Divide each side by '-3'.
x2 = 100

Simplifying
x2 = 100

Take the square root of each side:
x = {-10, 10}