(b-3)(2b+5)=

Solution for (b-3)(2b+5)= equation:

Simplifying
(b + -3)(2b + 5) = 0

Reorder the terms:
(-3 + b)(2b + 5) = 0

Reorder the terms:
(-3 + b)(5 + 2b) = 0

Multiply (-3 + b) * (5 + 2b)
(-3(5 + 2b) + b(5 + 2b)) = 0
((5 * -3 + 2b * -3) + b(5 + 2b)) = 0
((-15 + -6b) + b(5 + 2b)) = 0
(-15 + -6b + (5 * b + 2b * b)) = 0
(-15 + -6b + (5b + 2b2)) = 0

Combine like terms: -6b + 5b = -1b
(-15 + -1b + 2b2) = 0

Solving
-15 + -1b + 2b2 = 0

Solving for variable 'b'.

Factor a trinomial.
(-5 + -2b)(3 + -1b) = 0

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

Simplifying
-5 + -2b = 0

Solving
-5 + -2b = 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 + -2b = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2b = 0 + 5
-2b = 0 + 5

Combine like terms: 0 + 5 = 5
-2b = 5

Divide each side by '-2'.
b = -2.5

Simplifying
b = -2.5
Subproblem 2
Set the factor '(3 + -1b)' equal to zero and attempt to solve:

Simplifying
3 + -1b = 0

Solving
3 + -1b = 0

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

Add '-3' to each side of the equation.
3 + -3 + -1b = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1b = 0 + -3
-1b = 0 + -3

Combine like terms: 0 + -3 = -3
-1b = -3

Divide each side by '-1'.
b = 3

Simplifying
b = 3
Solution
b = {-2.5, 3}