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Simplifying
(b2 + -81) = 0
Reorder the terms:
(-81 + b2) = 0
Remove parenthesis around (-81 + b2)
-81 + b2 = 0
Solving
-81 + b2 = 0
Solving for variable 'b'.
Move all terms containing b to the left, all other terms to the right.
Add '81' to each side of the equation.
-81 + 81 + b2 = 0 + 81
Combine like terms: -81 + 81 = 0
0 + b2 = 0 + 81
b2 = 0 + 81
Combine like terms: 0 + 81 = 81
b2 = 81
Simplifying
b2 = 81
Take the square root of each side:
b = {-9, 9}
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