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Simplifying
x2 = 400 + -1x2
Solving
x2 = 400 + -1x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add 'x2' to each side of the equation.
x2 + x2 = 400 + -1x2 + x2
Combine like terms: x2 + x2 = 2x2
2x2 = 400 + -1x2 + x2
Combine like terms: -1x2 + x2 = 0
2x2 = 400 + 0
2x2 = 400
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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