A^2-4=

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Solution for A^2-4= equation: 


Simplifying
A2 + -4 = 0

Reorder the terms:
-4 + A2 = 0

Solving
-4 + A2 = 0

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 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + A2 = 0 + 4
A2 = 0 + 4

Combine like terms: 0 + 4 = 4
A2 = 4

Simplifying
A2 = 4

Take the square root of each side:
A = {-2, 2}

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