a^2-400=0

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Solution for a^2-400=0 equation: 


Simplifying
a2 + -400 = 0

Reorder the terms:
-400 + a2 = 0

Solving
-400 + a2 = 0

Solving for variable 'a'.

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

Add '400' to each side of the equation.
-400 + 400 + a2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + a2 = 0 + 400
a2 = 0 + 400

Combine like terms: 0 + 400 = 400
a2 = 400

Simplifying
a2 = 400

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

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