(3b+7)(3b-7)=

Solution for (3b+7)(3b-7)= equation:

Simplifying
(3b + 7)(3b + -7) = 0

Reorder the terms:
(7 + 3b)(3b + -7) = 0

Reorder the terms:
(7 + 3b)(-7 + 3b) = 0

Multiply (7 + 3b) * (-7 + 3b)
(7(-7 + 3b) + 3b * (-7 + 3b)) = 0
((-7 * 7 + 3b * 7) + 3b * (-7 + 3b)) = 0
((-49 + 21b) + 3b * (-7 + 3b)) = 0
(-49 + 21b + (-7 * 3b + 3b * 3b)) = 0
(-49 + 21b + (-21b + 9b2)) = 0

Combine like terms: 21b + -21b = 0
(-49 + 0 + 9b2) = 0
(-49 + 9b2) = 0

Solving
-49 + 9b2 = 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 + 9b2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + 9b2 = 0 + 49
9b2 = 0 + 49

Combine like terms: 0 + 49 = 49
9b2 = 49

Divide each side by '9'.
b2 = 5.444444444

Simplifying
b2 = 5.444444444

Take the square root of each side:
b = {-2.333333333, 2.333333333}