x(x+8x)=105

Solution for x(x+8x)=105 equation:

Simplifying
x(x + 8x) = 105

Combine like terms: x + 8x = 9x
x(9x) = 105

Remove parenthesis around (9x)
x * 9x = 105

Reorder the terms for easier multiplication:
9x * x = 105

Multiply x * x
9x2 = 105

Solving
9x2 = 105

Solving for variable 'x'.

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

Divide each side by '9'.
x2 = 11.66666667

Simplifying
x2 = 11.66666667

Take the square root of each side:
x = {-3.415650256, 3.415650256}