a^2-4=18

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Solution for a^2-4=18 equation: 


Simplifying
a2 + -4 = 18

Reorder the terms:
-4 + a2 = 18

Solving
-4 + a2 = 18

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 4 + a2 = 18 + 4

Combine like terms: -4 + 4 = 0
0 + a2 = 18 + 4
a2 = 18 + 4

Combine like terms: 18 + 4 = 22
a2 = 22

Simplifying
a2 = 22

Take the square root of each side:
a = {-4.69041576, 4.69041576}

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