m^2-20m-80=5

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Solution for m^2-20m-80=5 equation:


Simplifying
m2 + -20m + -80 = 5

Reorder the terms:
-80 + -20m + m2 = 5

Solving
-80 + -20m + m2 = 5

Solving for variable 'm'.

Reorder the terms:
-80 + -5 + -20m + m2 = 5 + -5

Combine like terms: -80 + -5 = -85
-85 + -20m + m2 = 5 + -5

Combine like terms: 5 + -5 = 0
-85 + -20m + m2 = 0

Begin completing the square.

Move the constant term to the right:

Add '85' to each side of the equation.
-85 + -20m + 85 + m2 = 0 + 85

Reorder the terms:
-85 + 85 + -20m + m2 = 0 + 85

Combine like terms: -85 + 85 = 0
0 + -20m + m2 = 0 + 85
-20m + m2 = 0 + 85

Combine like terms: 0 + 85 = 85
-20m + m2 = 85

The m term is -20m.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20m + 100 + m2 = 85 + 100

Reorder the terms:
100 + -20m + m2 = 85 + 100

Combine like terms: 85 + 100 = 185
100 + -20m + m2 = 185

Factor a perfect square on the left side:
(m + -10)(m + -10) = 185

Calculate the square root of the right side: 13.601470509

Break this problem into two subproblems by setting 
(m + -10) equal to 13.601470509 and -13.601470509.

Subproblem 1

m + -10 = 13.601470509 Simplifying m + -10 = 13.601470509 Reorder the terms: -10 + m = 13.601470509 Solving -10 + m = 13.601470509 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + m = 13.601470509 + 10 Combine like terms: -10 + 10 = 0 0 + m = 13.601470509 + 10 m = 13.601470509 + 10 Combine like terms: 13.601470509 + 10 = 23.601470509 m = 23.601470509 Simplifying m = 23.601470509

Subproblem 2

m + -10 = -13.601470509 Simplifying m + -10 = -13.601470509 Reorder the terms: -10 + m = -13.601470509 Solving -10 + m = -13.601470509 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + m = -13.601470509 + 10 Combine like terms: -10 + 10 = 0 0 + m = -13.601470509 + 10 m = -13.601470509 + 10 Combine like terms: -13.601470509 + 10 = -3.601470509 m = -3.601470509 Simplifying m = -3.601470509

Solution

The solution to the problem is based on the solutions from the subproblems. m = {23.601470509, -3.601470509}

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