X^2-400=

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Solution for X^2-400= equation: 


Simplifying
X2 + -400 = 0

Reorder the terms:
-400 + X2 = 0

Solving
-400 + X2 = 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 + X2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + X2 = 0 + 400
X2 = 0 + 400

Combine like terms: 0 + 400 = 400
X2 = 400

Simplifying
X2 = 400

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

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