2m^2-4m-7=0

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Solution for 2m^2-4m-7=0 equation:


Simplifying
2m2 + -4m + -7 = 0

Reorder the terms:
-7 + -4m + 2m2 = 0

Solving
-7 + -4m + 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 + -2m + m2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -2m + 3.5 + m2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -2m + m2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -2m + m2 = 0 + 3.5
-2m + m2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-2m + m2 = 3.5

The m term is -2m.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2m + 1 + m2 = 3.5 + 1

Reorder the terms:
1 + -2m + m2 = 3.5 + 1

Combine like terms: 3.5 + 1 = 4.5
1 + -2m + m2 = 4.5

Factor a perfect square on the left side:
(m + -1)(m + -1) = 4.5

Calculate the square root of the right side: 2.121320344

Break this problem into two subproblems by setting 
(m + -1) equal to 2.121320344 and -2.121320344.

Subproblem 1

m + -1 = 2.121320344 Simplifying m + -1 = 2.121320344 Reorder the terms: -1 + m = 2.121320344 Solving -1 + m = 2.121320344 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + m = 2.121320344 + 1 Combine like terms: -1 + 1 = 0 0 + m = 2.121320344 + 1 m = 2.121320344 + 1 Combine like terms: 2.121320344 + 1 = 3.121320344 m = 3.121320344 Simplifying m = 3.121320344

Subproblem 2

m + -1 = -2.121320344 Simplifying m + -1 = -2.121320344 Reorder the terms: -1 + m = -2.121320344 Solving -1 + m = -2.121320344 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + m = -2.121320344 + 1 Combine like terms: -1 + 1 = 0 0 + m = -2.121320344 + 1 m = -2.121320344 + 1 Combine like terms: -2.121320344 + 1 = -1.121320344 m = -1.121320344 Simplifying m = -1.121320344

Solution

The solution to the problem is based on the solutions from the subproblems. m = {3.121320344, -1.121320344}

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