a^2-100=21

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Solution for a^2-100=21 equation: 


Simplifying
a2 + -100 = 21

Reorder the terms:
-100 + a2 = 21

Solving
-100 + a2 = 21

Solving for variable 'a'.

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

Add '100' to each side of the equation.
-100 + 100 + a2 = 21 + 100

Combine like terms: -100 + 100 = 0
0 + a2 = 21 + 100
a2 = 21 + 100

Combine like terms: 21 + 100 = 121
a2 = 121

Simplifying
a2 = 121

Take the square root of each side:
a = {-11, 11}

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