8b^2-72b=b-9

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Solution for 8b^2-72b=b-9 equation:


Simplifying
8b2 + -72b = b + -9

Reorder the terms:
-72b + 8b2 = b + -9

Reorder the terms:
-72b + 8b2 = -9 + b

Solving
-72b + 8b2 = -9 + b

Solving for variable 'b'.

Reorder the terms:
9 + -72b + -1b + 8b2 = -9 + b + 9 + -1b

Combine like terms: -72b + -1b = -73b
9 + -73b + 8b2 = -9 + b + 9 + -1b

Reorder the terms:
9 + -73b + 8b2 = -9 + 9 + b + -1b

Combine like terms: -9 + 9 = 0
9 + -73b + 8b2 = 0 + b + -1b
9 + -73b + 8b2 = b + -1b

Combine like terms: b + -1b = 0
9 + -73b + 8b2 = 0

Factor a trinomial.
(1 + -8b)(9 + -1b) = 0

Subproblem 1

Set the factor '(1 + -8b)' equal to zero and attempt to solve: Simplifying 1 + -8b = 0 Solving 1 + -8b = 0 Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -8b = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -8b = 0 + -1 -8b = 0 + -1 Combine like terms: 0 + -1 = -1 -8b = -1 Divide each side by '-8'. b = 0.125 Simplifying b = 0.125

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 = {0.125, 9}

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