(3b+6)(3b-6)=

Solution for (3b+6)(3b-6)= equation:

Simplifying
(3b + 6)(3b + -6) = 0

Reorder the terms:
(6 + 3b)(3b + -6) = 0

Reorder the terms:
(6 + 3b)(-6 + 3b) = 0

Multiply (6 + 3b) * (-6 + 3b)
(6(-6 + 3b) + 3b * (-6 + 3b)) = 0
((-6 * 6 + 3b * 6) + 3b * (-6 + 3b)) = 0
((-36 + 18b) + 3b * (-6 + 3b)) = 0
(-36 + 18b + (-6 * 3b + 3b * 3b)) = 0
(-36 + 18b + (-18b + 9b2)) = 0

Combine like terms: 18b + -18b = 0
(-36 + 0 + 9b2) = 0
(-36 + 9b2) = 0

Solving
-36 + 9b2 = 0

Solving for variable 'b'.

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

Add '36' to each side of the equation.
-36 + 36 + 9b2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 9b2 = 0 + 36
9b2 = 0 + 36

Combine like terms: 0 + 36 = 36
9b2 = 36

Divide each side by '9'.
b2 = 4

Simplifying
b2 = 4

Take the square root of each side:
b = {-2, 2}