a^2-21=15

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Solution for a^2-21=15 equation: 


Simplifying
a2 + -21 = 15

Reorder the terms:
-21 + a2 = 15

Solving
-21 + a2 = 15

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + a2 = 15 + 21

Combine like terms: -21 + 21 = 0
0 + a2 = 15 + 21
a2 = 15 + 21

Combine like terms: 15 + 21 = 36
a2 = 36

Simplifying
a2 = 36

Take the square root of each side:
a = {-6, 6}

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