m^2-28m=39

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Solution for m^2-28m=39 equation:


Simplifying
m2 + -28m = 39

Reorder the terms:
-28m + m2 = 39

Solving
-28m + m2 = 39

Solving for variable 'm'.

Reorder the terms:
-39 + -28m + m2 = 39 + -39

Combine like terms: 39 + -39 = 0
-39 + -28m + m2 = 0

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + -28m + 39 + m2 = 0 + 39

Reorder the terms:
-39 + 39 + -28m + m2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + -28m + m2 = 0 + 39
-28m + m2 = 0 + 39

Combine like terms: 0 + 39 = 39
-28m + m2 = 39

The m term is -28m.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28m + 196 + m2 = 39 + 196

Reorder the terms:
196 + -28m + m2 = 39 + 196

Combine like terms: 39 + 196 = 235
196 + -28m + m2 = 235

Factor a perfect square on the left side:
(m + -14)(m + -14) = 235

Calculate the square root of the right side: 15.329709717

Break this problem into two subproblems by setting 
(m + -14) equal to 15.329709717 and -15.329709717.

Subproblem 1

m + -14 = 15.329709717 Simplifying m + -14 = 15.329709717 Reorder the terms: -14 + m = 15.329709717 Solving -14 + m = 15.329709717 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + m = 15.329709717 + 14 Combine like terms: -14 + 14 = 0 0 + m = 15.329709717 + 14 m = 15.329709717 + 14 Combine like terms: 15.329709717 + 14 = 29.329709717 m = 29.329709717 Simplifying m = 29.329709717

Subproblem 2

m + -14 = -15.329709717 Simplifying m + -14 = -15.329709717 Reorder the terms: -14 + m = -15.329709717 Solving -14 + m = -15.329709717 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + m = -15.329709717 + 14 Combine like terms: -14 + 14 = 0 0 + m = -15.329709717 + 14 m = -15.329709717 + 14 Combine like terms: -15.329709717 + 14 = -1.329709717 m = -1.329709717 Simplifying m = -1.329709717

Solution

The solution to the problem is based on the solutions from the subproblems. m = {29.329709717, -1.329709717}

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