m^2-9m-55=0

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Solution for m^2-9m-55=0 equation:


Simplifying
m2 + -9m + -55 = 0

Reorder the terms:
-55 + -9m + m2 = 0

Solving
-55 + -9m + m2 = 0

Solving for variable 'm'.

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + -9m + 55 + m2 = 0 + 55

Reorder the terms:
-55 + 55 + -9m + m2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + -9m + m2 = 0 + 55
-9m + m2 = 0 + 55

Combine like terms: 0 + 55 = 55
-9m + m2 = 55

The m term is -9m.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9m + 20.25 + m2 = 55 + 20.25

Reorder the terms:
20.25 + -9m + m2 = 55 + 20.25

Combine like terms: 55 + 20.25 = 75.25
20.25 + -9m + m2 = 75.25

Factor a perfect square on the left side:
(m + -4.5)(m + -4.5) = 75.25

Calculate the square root of the right side: 8.674675786

Break this problem into two subproblems by setting 
(m + -4.5) equal to 8.674675786 and -8.674675786.

Subproblem 1

m + -4.5 = 8.674675786 Simplifying m + -4.5 = 8.674675786 Reorder the terms: -4.5 + m = 8.674675786 Solving -4.5 + m = 8.674675786 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + m = 8.674675786 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + m = 8.674675786 + 4.5 m = 8.674675786 + 4.5 Combine like terms: 8.674675786 + 4.5 = 13.174675786 m = 13.174675786 Simplifying m = 13.174675786

Subproblem 2

m + -4.5 = -8.674675786 Simplifying m + -4.5 = -8.674675786 Reorder the terms: -4.5 + m = -8.674675786 Solving -4.5 + m = -8.674675786 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + m = -8.674675786 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + m = -8.674675786 + 4.5 m = -8.674675786 + 4.5 Combine like terms: -8.674675786 + 4.5 = -4.174675786 m = -4.174675786 Simplifying m = -4.174675786

Solution

The solution to the problem is based on the solutions from the subproblems. m = {13.174675786, -4.174675786}

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