(x)(x*4)=357

Solution for (x)(x*4)=357 equation:

Simplifying
(x)(x * 4) = 357

Reorder the terms for easier multiplication:
x(4x) = 357

Remove parenthesis around (4x)
x * 4x = 357

Reorder the terms for easier multiplication:
4x * x = 357

Multiply x * x
4x2 = 357

Solving
4x2 = 357

Solving for variable 'x'.

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

Divide each side by '4'.
x2 = 89.25

Simplifying
x2 = 89.25

Take the square root of each side:
x = {-9.447221814, 9.447221814}