(b+7)(b-7)=

Solution for (b+7)(b-7)= equation:

Simplifying
(b + 7)(b + -7) = 0

Reorder the terms:
(7 + b)(b + -7) = 0

Reorder the terms:
(7 + b)(-7 + b) = 0

Multiply (7 + b) * (-7 + b)
(7(-7 + b) + b(-7 + b)) = 0
((-7 * 7 + b * 7) + b(-7 + b)) = 0
((-49 + 7b) + b(-7 + b)) = 0
(-49 + 7b + (-7 * b + b * b)) = 0
(-49 + 7b + (-7b + b2)) = 0

Combine like terms: 7b + -7b = 0
(-49 + 0 + b2) = 0
(-49 + b2) = 0

Solving
-49 + b2 = 0

Solving for variable 'b'.

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

Add '49' to each side of the equation.
-49 + 49 + b2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + b2 = 0 + 49
b2 = 0 + 49

Combine like terms: 0 + 49 = 49
b2 = 49

Simplifying
b2 = 49

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