m^2-8m=15

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Solution for m^2-8m=15 equation:


Simplifying
m2 + -8m = 15

Reorder the terms:
-8m + m2 = 15

Solving
-8m + m2 = 15

Solving for variable 'm'.

Reorder the terms:
-15 + -8m + m2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -8m + m2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -8m + 15 + m2 = 0 + 15

Reorder the terms:
-15 + 15 + -8m + m2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -8m + m2 = 0 + 15
-8m + m2 = 0 + 15

Combine like terms: 0 + 15 = 15
-8m + m2 = 15

The m term is -8m.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8m + 16 + m2 = 15 + 16

Reorder the terms:
16 + -8m + m2 = 15 + 16

Combine like terms: 15 + 16 = 31
16 + -8m + m2 = 31

Factor a perfect square on the left side:
(m + -4)(m + -4) = 31

Calculate the square root of the right side: 5.567764363

Break this problem into two subproblems by setting 
(m + -4) equal to 5.567764363 and -5.567764363.

Subproblem 1

m + -4 = 5.567764363 Simplifying m + -4 = 5.567764363 Reorder the terms: -4 + m = 5.567764363 Solving -4 + m = 5.567764363 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + m = 5.567764363 + 4 Combine like terms: -4 + 4 = 0 0 + m = 5.567764363 + 4 m = 5.567764363 + 4 Combine like terms: 5.567764363 + 4 = 9.567764363 m = 9.567764363 Simplifying m = 9.567764363

Subproblem 2

m + -4 = -5.567764363 Simplifying m + -4 = -5.567764363 Reorder the terms: -4 + m = -5.567764363 Solving -4 + m = -5.567764363 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + m = -5.567764363 + 4 Combine like terms: -4 + 4 = 0 0 + m = -5.567764363 + 4 m = -5.567764363 + 4 Combine like terms: -5.567764363 + 4 = -1.567764363 m = -1.567764363 Simplifying m = -1.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. m = {9.567764363, -1.567764363}

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