9b^2+13b+4=0

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

Simplifying
9b2 + 13b + 4 = 0

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

Solving
4 + 13b + 9b2 = 0

Solving for variable 'b'.

Factor a trinomial.
(1 + b)(4 + 9b) = 0

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

Simplifying
1 + b = 0

Solving
1 + b = 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 + b = 0 + -1

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

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

Simplifying
b = -1
Subproblem 2
Set the factor '(4 + 9b)' equal to zero and attempt to solve:

Simplifying
4 + 9b = 0

Solving
4 + 9b = 0

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

Add '-4' to each side of the equation.
4 + -4 + 9b = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 9b = 0 + -4
9b = 0 + -4

Combine like terms: 0 + -4 = -4
9b = -4

Divide each side by '9'.
b = -0.4444444444

Simplifying
b = -0.4444444444
Solution
b = {-1, -0.4444444444}