b^2-6b-9=7

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Solution for b^2-6b-9=7 equation:


Simplifying
b2 + -6b + -9 = 7

Reorder the terms:
-9 + -6b + b2 = 7

Solving
-9 + -6b + b2 = 7

Solving for variable 'b'.

Reorder the terms:
-9 + -7 + -6b + b2 = 7 + -7

Combine like terms: -9 + -7 = -16
-16 + -6b + b2 = 7 + -7

Combine like terms: 7 + -7 = 0
-16 + -6b + b2 = 0

Factor a trinomial.
(-2 + -1b)(8 + -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 '(8 + -1b)' equal to zero and attempt to solve: Simplifying 8 + -1b = 0 Solving 8 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1b = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1b = 0 + -8 -1b = 0 + -8 Combine like terms: 0 + -8 = -8 -1b = -8 Divide each side by '-1'. b = 8 Simplifying b = 8

Solution

b = {-2, 8}

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