A^2-9=-1

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Solution for A^2-9=-1 equation: 


Simplifying
A2 + -9 = -1

Reorder the terms:
-9 + A2 = -1

Solving
-9 + A2 = -1

Solving for variable 'A'.

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

Add '9' to each side of the equation.
-9 + 9 + A2 = -1 + 9

Combine like terms: -9 + 9 = 0
0 + A2 = -1 + 9
A2 = -1 + 9

Combine like terms: -1 + 9 = 8
A2 = 8

Simplifying
A2 = 8

Take the square root of each side:
A = {-2.828427125, 2.828427125}

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