2m^2-8m-47=0

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Solution for 2m^2-8m-47=0 equation:


Simplifying
2m2 + -8m + -47 = 0

Reorder the terms:
-47 + -8m + 2m2 = 0

Solving
-47 + -8m + 2m2 = 0

Solving for variable 'm'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-23.5 + -4m + m2 = 0

Move the constant term to the right:

Add '23.5' to each side of the equation.
-23.5 + -4m + 23.5 + m2 = 0 + 23.5

Reorder the terms:
-23.5 + 23.5 + -4m + m2 = 0 + 23.5

Combine like terms: -23.5 + 23.5 = 0.0
0.0 + -4m + m2 = 0 + 23.5
-4m + m2 = 0 + 23.5

Combine like terms: 0 + 23.5 = 23.5
-4m + m2 = 23.5

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 = 23.5 + 4

Reorder the terms:
4 + -4m + m2 = 23.5 + 4

Combine like terms: 23.5 + 4 = 27.5
4 + -4m + m2 = 27.5

Factor a perfect square on the left side:
(m + -2)(m + -2) = 27.5

Calculate the square root of the right side: 5.244044241

Break this problem into two subproblems by setting 
(m + -2) equal to 5.244044241 and -5.244044241.

Subproblem 1

m + -2 = 5.244044241 Simplifying m + -2 = 5.244044241 Reorder the terms: -2 + m = 5.244044241 Solving -2 + m = 5.244044241 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 = 5.244044241 + 2 Combine like terms: -2 + 2 = 0 0 + m = 5.244044241 + 2 m = 5.244044241 + 2 Combine like terms: 5.244044241 + 2 = 7.244044241 m = 7.244044241 Simplifying m = 7.244044241

Subproblem 2

m + -2 = -5.244044241 Simplifying m + -2 = -5.244044241 Reorder the terms: -2 + m = -5.244044241 Solving -2 + m = -5.244044241 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 = -5.244044241 + 2 Combine like terms: -2 + 2 = 0 0 + m = -5.244044241 + 2 m = -5.244044241 + 2 Combine like terms: -5.244044241 + 2 = -3.244044241 m = -3.244044241 Simplifying m = -3.244044241

Solution

The solution to the problem is based on the solutions from the subproblems. m = {7.244044241, -3.244044241}

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