a^2-9=40

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Solution for a^2-9=40 equation: 


Simplifying
a2 + -9 = 40

Reorder the terms:
-9 + a2 = 40

Solving
-9 + a2 = 40

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 = 40 + 9

Combine like terms: -9 + 9 = 0
0 + a2 = 40 + 9
a2 = 40 + 9

Combine like terms: 40 + 9 = 49
a2 = 49

Simplifying
a2 = 49

Take the square root of each side:
a = {-7, 7}

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