b^2-81=0factor

Solution for b^2-81=0factor equation:

Simplifying
b2 + -81 = 0factor

Reorder the terms:
-81 + b2 = 0factor

Anything times zero is zero.
-81 + b2 = 0acfort

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}