13b^2+4b-9=0

Solution for 13b^2+4b-9=0 equation:

Simplifying
13b2 + 4b + -9 = 0

Reorder the terms:
-9 + 4b + 13b2 = 0

Solving
-9 + 4b + 13b2 = 0

Solving for variable 'b'.

Factor a trinomial.
(-1 + -1b)(9 + -13b) = 0

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 '(9 + -13b)' equal to zero and attempt to solve:

Simplifying
9 + -13b = 0

Solving
9 + -13b = 0

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

Add '-9' to each side of the equation.
9 + -9 + -13b = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -13b = 0 + -9
-13b = 0 + -9

Combine like terms: 0 + -9 = -9
-13b = -9

Divide each side by '-13'.
b = 0.6923076923

Simplifying
b = 0.6923076923
Solution
b = {-1, 0.6923076923}