9(b^2-2b)=8b^2-81

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Solution for 9(b^2-2b)=8b^2-81 equation:


Simplifying
9(b2 + -2b) = 8b2 + -81

Reorder the terms:
9(-2b + b2) = 8b2 + -81
(-2b * 9 + b2 * 9) = 8b2 + -81
(-18b + 9b2) = 8b2 + -81

Reorder the terms:
-18b + 9b2 = -81 + 8b2

Solving
-18b + 9b2 = -81 + 8b2

Solving for variable 'b'.

Reorder the terms:
81 + -18b + 9b2 + -8b2 = -81 + 8b2 + 81 + -8b2

Combine like terms: 9b2 + -8b2 = 1b2
81 + -18b + 1b2 = -81 + 8b2 + 81 + -8b2

Reorder the terms:
81 + -18b + 1b2 = -81 + 81 + 8b2 + -8b2

Combine like terms: -81 + 81 = 0
81 + -18b + 1b2 = 0 + 8b2 + -8b2
81 + -18b + 1b2 = 8b2 + -8b2

Combine like terms: 8b2 + -8b2 = 0
81 + -18b + 1b2 = 0

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

Subproblem 1

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

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 = {9, 9}

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