x*2x=400

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Solution for x*2x=400 equation: 


Simplifying
x * 2x = 400

Reorder the terms for easier multiplication:
2x * x = 400

Multiply x * x
2x2 = 400

Solving
2x2 = 400

Solving for variable 'x'.

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

Divide each side by '2'.
x2 = 200

Simplifying
x2 = 200

Take the square root of each side:
x = {-14.142135624, 14.142135624}

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