(b-5)(3b+3)=

Solution for (b-5)(3b+3)= equation:

Simplifying
(b + -5)(3b + 3) = 0

Reorder the terms:
(-5 + b)(3b + 3) = 0

Reorder the terms:
(-5 + b)(3 + 3b) = 0

Multiply (-5 + b) * (3 + 3b)
(-5(3 + 3b) + b(3 + 3b)) = 0
((3 * -5 + 3b * -5) + b(3 + 3b)) = 0
((-15 + -15b) + b(3 + 3b)) = 0
(-15 + -15b + (3 * b + 3b * b)) = 0
(-15 + -15b + (3b + 3b2)) = 0

Combine like terms: -15b + 3b = -12b
(-15 + -12b + 3b2) = 0

Solving
-15 + -12b + 3b2 = 0

Solving for variable 'b'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-5 + -4b + b2) = 0

Factor a trinomial.
3((-1 + -1b)(5 + -1b)) = 0

Ignore the factor 3.
Subproblem 1
Set the factor '(-1 + -1b)' equal to zero and attempt to solve:

Simplifying
-1 + -1b = 0

Solving
-1 + -1b = 0

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

Add '1' to each side of the equation.
-1 + 1 + -1b = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1b = 0 + 1
-1b = 0 + 1

Combine like terms: 0 + 1 = 1
-1b = 1

Divide each side by '-1'.
b = -1

Simplifying
b = -1
Subproblem 2
Set the factor '(5 + -1b)' equal to zero and attempt to solve:

Simplifying
5 + -1b = 0

Solving
5 + -1b = 0

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

Add '-5' to each side of the equation.
5 + -5 + -1b = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1b = 0 + -5
-1b = 0 + -5

Combine like terms: 0 + -5 = -5
-1b = -5

Divide each side by '-1'.
b = 5

Simplifying
b = 5
Solution
b = {-1, 5}