9(m+8)=8(m+9)m

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Solution for 9(m+8)=8(m+9)m equation:


Simplifying
9(m + 8) = 8(m + 9) * m

Reorder the terms:
9(8 + m) = 8(m + 9) * m
(8 * 9 + m * 9) = 8(m + 9) * m
(72 + 9m) = 8(m + 9) * m

Reorder the terms:
72 + 9m = 8(9 + m) * m

Reorder the terms for easier multiplication:
72 + 9m = 8m(9 + m)
72 + 9m = (9 * 8m + m * 8m)
72 + 9m = (72m + 8m2)

Solving
72 + 9m = 72m + 8m2

Solving for variable 'm'.

Combine like terms: 9m + -72m = -63m
72 + -63m + -8m2 = 72m + 8m2 + -72m + -8m2

Reorder the terms:
72 + -63m + -8m2 = 72m + -72m + 8m2 + -8m2

Combine like terms: 72m + -72m = 0
72 + -63m + -8m2 = 0 + 8m2 + -8m2
72 + -63m + -8m2 = 8m2 + -8m2

Combine like terms: 8m2 + -8m2 = 0
72 + -63m + -8m2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-9 + 7.875m + m2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 7.875m + 9 + m2 = 0 + 9

Reorder the terms:
-9 + 9 + 7.875m + m2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 7.875m + m2 = 0 + 9
7.875m + m2 = 0 + 9

Combine like terms: 0 + 9 = 9
7.875m + m2 = 9

The m term is 7.875m.  Take half its coefficient (3.9375).
Square it (15.50390625) and add it to both sides.

Add '15.50390625' to each side of the equation.
7.875m + 15.50390625 + m2 = 9 + 15.50390625

Reorder the terms:
15.50390625 + 7.875m + m2 = 9 + 15.50390625

Combine like terms: 9 + 15.50390625 = 24.50390625
15.50390625 + 7.875m + m2 = 24.50390625

Factor a perfect square on the left side:
(m + 3.9375)(m + 3.9375) = 24.50390625

Calculate the square root of the right side: 4.950142043

Break this problem into two subproblems by setting 
(m + 3.9375) equal to 4.950142043 and -4.950142043.

Subproblem 1

m + 3.9375 = 4.950142043 Simplifying m + 3.9375 = 4.950142043 Reorder the terms: 3.9375 + m = 4.950142043 Solving 3.9375 + m = 4.950142043 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-3.9375' to each side of the equation. 3.9375 + -3.9375 + m = 4.950142043 + -3.9375 Combine like terms: 3.9375 + -3.9375 = 0.0000 0.0000 + m = 4.950142043 + -3.9375 m = 4.950142043 + -3.9375 Combine like terms: 4.950142043 + -3.9375 = 1.012642043 m = 1.012642043 Simplifying m = 1.012642043

Subproblem 2

m + 3.9375 = -4.950142043 Simplifying m + 3.9375 = -4.950142043 Reorder the terms: 3.9375 + m = -4.950142043 Solving 3.9375 + m = -4.950142043 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-3.9375' to each side of the equation. 3.9375 + -3.9375 + m = -4.950142043 + -3.9375 Combine like terms: 3.9375 + -3.9375 = 0.0000 0.0000 + m = -4.950142043 + -3.9375 m = -4.950142043 + -3.9375 Combine like terms: -4.950142043 + -3.9375 = -8.887642043 m = -8.887642043 Simplifying m = -8.887642043

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.012642043, -8.887642043}

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