400-x^2=0

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Solution for 400-x^2=0 equation: 


Simplifying
400 + -1x2 = 0

Solving
400 + -1x2 = 0

Solving for variable 'x'.

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

Add '-400' to each side of the equation.
400 + -400 + -1x2 = 0 + -400

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

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

Divide each side by '-1'.
x2 = 400

Simplifying
x2 = 400

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

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