b^2-12b-20=8

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Solution for b^2-12b-20=8 equation:


Simplifying
b2 + -12b + -20 = 8

Reorder the terms:
-20 + -12b + b2 = 8

Solving
-20 + -12b + b2 = 8

Solving for variable 'b'.

Reorder the terms:
-20 + -8 + -12b + b2 = 8 + -8

Combine like terms: -20 + -8 = -28
-28 + -12b + b2 = 8 + -8

Combine like terms: 8 + -8 = 0
-28 + -12b + b2 = 0

Factor a trinomial.
(-2 + -1b)(14 + -1b) = 0

Subproblem 1

Set the factor '(-2 + -1b)' equal to zero and attempt to solve: Simplifying -2 + -1b = 0 Solving -2 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1b = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1b = 0 + 2 -1b = 0 + 2 Combine like terms: 0 + 2 = 2 -1b = 2 Divide each side by '-1'. b = -2 Simplifying b = -2

Subproblem 2

Set the factor '(14 + -1b)' equal to zero and attempt to solve: Simplifying 14 + -1b = 0 Solving 14 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + -1b = 0 + -14 Combine like terms: 14 + -14 = 0 0 + -1b = 0 + -14 -1b = 0 + -14 Combine like terms: 0 + -14 = -14 -1b = -14 Divide each side by '-1'. b = 14 Simplifying b = 14

Solution

b = {-2, 14}

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