3a^2-21=27

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Solution for 3a^2-21=27 equation: 


Simplifying
3a2 + -21 = 27

Reorder the terms:
-21 + 3a2 = 27

Solving
-21 + 3a2 = 27

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 + 3a2 = 27 + 21

Combine like terms: -21 + 21 = 0
0 + 3a2 = 27 + 21
3a2 = 27 + 21

Combine like terms: 27 + 21 = 48
3a2 = 48

Divide each side by '3'.
a2 = 16

Simplifying
a2 = 16

Take the square root of each side:
a = {-4, 4}

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