15b^2+15b-30=0

Solution for 15b^2+15b-30=0 equation:

Simplifying
15b2 + 15b + -30 = 0

Reorder the terms:
-30 + 15b + 15b2 = 0

Solving
-30 + 15b + 15b2 = 0

Solving for variable 'b'.

Factor out the Greatest Common Factor (GCF), '15'.
15(-2 + b + b2) = 0

Factor a trinomial.
15((-2 + -1b)(1 + -1b)) = 0

Ignore the factor 15.
Subproblem 1
Set the factor '(-2 + -1b)' equal to zero and attempt to solve:

Simplifying
-2 + -1b = 0

Solving
-2 + -1b = 0

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

Add '2' to each side of the equation.
-2 + 2 + -1b = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1b = 0 + 2
-1b = 0 + 2

Combine like terms: 0 + 2 = 2
-1b = 2

Divide each side by '-1'.
b = -2

Simplifying
b = -2
Subproblem 2
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
Solution
b = {-2, 1}