m^2-4m=55

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Solution for m^2-4m=55 equation:


Simplifying
m2 + -4m = 55

Reorder the terms:
-4m + m2 = 55

Solving
-4m + m2 = 55

Solving for variable 'm'.

Reorder the terms:
-55 + -4m + m2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + -4m + m2 = 0

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + -4m + 55 + m2 = 0 + 55

Reorder the terms:
-55 + 55 + -4m + m2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + -4m + m2 = 0 + 55
-4m + m2 = 0 + 55

Combine like terms: 0 + 55 = 55
-4m + m2 = 55

The m term is -4m.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4m + 4 + m2 = 55 + 4

Reorder the terms:
4 + -4m + m2 = 55 + 4

Combine like terms: 55 + 4 = 59
4 + -4m + m2 = 59

Factor a perfect square on the left side:
(m + -2)(m + -2) = 59

Calculate the square root of the right side: 7.681145748

Break this problem into two subproblems by setting 
(m + -2) equal to 7.681145748 and -7.681145748.

Subproblem 1

m + -2 = 7.681145748 Simplifying m + -2 = 7.681145748 Reorder the terms: -2 + m = 7.681145748 Solving -2 + m = 7.681145748 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + m = 7.681145748 + 2 Combine like terms: -2 + 2 = 0 0 + m = 7.681145748 + 2 m = 7.681145748 + 2 Combine like terms: 7.681145748 + 2 = 9.681145748 m = 9.681145748 Simplifying m = 9.681145748

Subproblem 2

m + -2 = -7.681145748 Simplifying m + -2 = -7.681145748 Reorder the terms: -2 + m = -7.681145748 Solving -2 + m = -7.681145748 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + m = -7.681145748 + 2 Combine like terms: -2 + 2 = 0 0 + m = -7.681145748 + 2 m = -7.681145748 + 2 Combine like terms: -7.681145748 + 2 = -5.681145748 m = -5.681145748 Simplifying m = -5.681145748

Solution

The solution to the problem is based on the solutions from the subproblems. m = {9.681145748, -5.681145748}

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