0=-x^2+400

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Solution for 0=-x^2+400 equation: 


Simplifying
0 = -1x2 + 400

Reorder the terms:
0 = 400 + -1x2

Solving
0 = 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.
0 + x2 = 400 + -1x2 + x2
Remove the zero:
x2 = 400 + -1x2 + x2

Combine like terms: -1x2 + x2 = 0
x2 = 400 + 0
x2 = 400

Simplifying
x2 = 400

Take the square root of each side:
x = {-20, 20}

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