7b^2-7b-132=8

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Solution for 7b^2-7b-132=8 equation:


Simplifying
7b2 + -7b + -132 = 8

Reorder the terms:
-132 + -7b + 7b2 = 8

Solving
-132 + -7b + 7b2 = 8

Solving for variable 'b'.

Reorder the terms:
-132 + -8 + -7b + 7b2 = 8 + -8

Combine like terms: -132 + -8 = -140
-140 + -7b + 7b2 = 8 + -8

Combine like terms: 8 + -8 = 0
-140 + -7b + 7b2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(-20 + -1b + b2) = 0

Factor a trinomial.
7((-4 + -1b)(5 + -1b)) = 0

Ignore the factor 7.

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 '(5 + -1b)' equal to zero and attempt to solve: Simplifying 5 + -1b = 0 Solving 5 + -1b = 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 + -1b = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1b = 0 + -5 -1b = 0 + -5 Combine like terms: 0 + -5 = -5 -1b = -5 Divide each side by '-1'. b = 5 Simplifying b = 5

Solution

b = {-4, 5}

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