(x)(2x)=40

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Solution for (x)(2x)=40 equation: 


Simplifying
(x)(2x) = 40

Remove parenthesis around (2x)
x * 2x = 40

Reorder the terms for easier multiplication:
2x * x = 40

Multiply x * x
2x2 = 40

Solving
2x2 = 40

Solving for variable 'x'.

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

Divide each side by '2'.
x2 = 20

Simplifying
x2 = 20

Take the square root of each side:
x = {-4.472135955, 4.472135955}

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