m^2-4m-66=0

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Solution for m^2-4m-66=0 equation:


Simplifying
m2 + -4m + -66 = 0

Reorder the terms:
-66 + -4m + m2 = 0

Solving
-66 + -4m + m2 = 0

Solving for variable 'm'.

Begin completing the square.

Move the constant term to the right:

Add '66' to each side of the equation.
-66 + -4m + 66 + m2 = 0 + 66

Reorder the terms:
-66 + 66 + -4m + m2 = 0 + 66

Combine like terms: -66 + 66 = 0
0 + -4m + m2 = 0 + 66
-4m + m2 = 0 + 66

Combine like terms: 0 + 66 = 66
-4m + m2 = 66

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 = 66 + 4

Reorder the terms:
4 + -4m + m2 = 66 + 4

Combine like terms: 66 + 4 = 70
4 + -4m + m2 = 70

Factor a perfect square on the left side:
(m + -2)(m + -2) = 70

Calculate the square root of the right side: 8.366600265

Break this problem into two subproblems by setting 
(m + -2) equal to 8.366600265 and -8.366600265.

Subproblem 1

m + -2 = 8.366600265 Simplifying m + -2 = 8.366600265 Reorder the terms: -2 + m = 8.366600265 Solving -2 + m = 8.366600265 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 = 8.366600265 + 2 Combine like terms: -2 + 2 = 0 0 + m = 8.366600265 + 2 m = 8.366600265 + 2 Combine like terms: 8.366600265 + 2 = 10.366600265 m = 10.366600265 Simplifying m = 10.366600265

Subproblem 2

m + -2 = -8.366600265 Simplifying m + -2 = -8.366600265 Reorder the terms: -2 + m = -8.366600265 Solving -2 + m = -8.366600265 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 = -8.366600265 + 2 Combine like terms: -2 + 2 = 0 0 + m = -8.366600265 + 2 m = -8.366600265 + 2 Combine like terms: -8.366600265 + 2 = -6.366600265 m = -6.366600265 Simplifying m = -6.366600265

Solution

The solution to the problem is based on the solutions from the subproblems. m = {10.366600265, -6.366600265}

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