2m^2+56m-7=0

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Solution for 2m^2+56m-7=0 equation:


Simplifying
2m2 + 56m + -7 = 0

Reorder the terms:
-7 + 56m + 2m2 = 0

Solving
-7 + 56m + 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'.
-3.5 + 28m + m2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 28m + 3.5 + m2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 28m + m2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 28m + m2 = 0 + 3.5
28m + m2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
28m + m2 = 3.5

The m term is 28m.  Take half its coefficient (14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
28m + 196 + m2 = 3.5 + 196

Reorder the terms:
196 + 28m + m2 = 3.5 + 196

Combine like terms: 3.5 + 196 = 199.5
196 + 28m + m2 = 199.5

Factor a perfect square on the left side:
(m + 14)(m + 14) = 199.5

Calculate the square root of the right side: 14.124446892

Break this problem into two subproblems by setting 
(m + 14) equal to 14.124446892 and -14.124446892.

Subproblem 1

m + 14 = 14.124446892 Simplifying m + 14 = 14.124446892 Reorder the terms: 14 + m = 14.124446892 Solving 14 + m = 14.124446892 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + m = 14.124446892 + -14 Combine like terms: 14 + -14 = 0 0 + m = 14.124446892 + -14 m = 14.124446892 + -14 Combine like terms: 14.124446892 + -14 = 0.124446892 m = 0.124446892 Simplifying m = 0.124446892

Subproblem 2

m + 14 = -14.124446892 Simplifying m + 14 = -14.124446892 Reorder the terms: 14 + m = -14.124446892 Solving 14 + m = -14.124446892 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + m = -14.124446892 + -14 Combine like terms: 14 + -14 = 0 0 + m = -14.124446892 + -14 m = -14.124446892 + -14 Combine like terms: -14.124446892 + -14 = -28.124446892 m = -28.124446892 Simplifying m = -28.124446892

Solution

The solution to the problem is based on the solutions from the subproblems. m = {0.124446892, -28.124446892}

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