(b+4)(b-9)=0

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Solution for (b+4)(b-9)=0 equation:


Simplifying
(b + 4)(b + -9) = 0

Reorder the terms:
(4 + b)(b + -9) = 0

Reorder the terms:
(4 + b)(-9 + b) = 0

Multiply (4 + b) * (-9 + b)
(4(-9 + b) + b(-9 + b)) = 0
((-9 * 4 + b * 4) + b(-9 + b)) = 0
((-36 + 4b) + b(-9 + b)) = 0
(-36 + 4b + (-9 * b + b * b)) = 0
(-36 + 4b + (-9b + b2)) = 0

Combine like terms: 4b + -9b = -5b
(-36 + -5b + b2) = 0

Solving
-36 + -5b + b2 = 0

Solving for variable 'b'.

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

Subproblem 1

Set the factor '(-4 + -1b)' equal to zero and attempt to solve: Simplifying -4 + -1b = 0 Solving -4 + -1b = 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 + -1b = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1b = 0 + 4 -1b = 0 + 4 Combine like terms: 0 + 4 = 4 -1b = 4 Divide each side by '-1'. b = -4 Simplifying b = -4

Subproblem 2

Set the factor '(9 + -1b)' equal to zero and attempt to solve: Simplifying 9 + -1b = 0 Solving 9 + -1b = 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 + -1b = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1b = 0 + -9 -1b = 0 + -9 Combine like terms: 0 + -9 = -9 -1b = -9 Divide each side by '-1'. b = 9 Simplifying b = 9

Solution

b = {-4, 9}

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