2m^2-2m-15=0

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Solution for 2m^2-2m-15=0 equation:


Simplifying
2m2 + -2m + -15 = 0

Reorder the terms:
-15 + -2m + 2m2 = 0

Solving
-15 + -2m + 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'.
-7.5 + -1m + m2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + -1m + 7.5 + m2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + -1m + m2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + -1m + m2 = 0 + 7.5
-1m + m2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
-1m + m2 = 7.5

The m term is -1m.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1m + 0.25 + m2 = 7.5 + 0.25

Reorder the terms:
0.25 + -1m + m2 = 7.5 + 0.25

Combine like terms: 7.5 + 0.25 = 7.75
0.25 + -1m + m2 = 7.75

Factor a perfect square on the left side:
(m + -0.5)(m + -0.5) = 7.75

Calculate the square root of the right side: 2.783882181

Break this problem into two subproblems by setting 
(m + -0.5) equal to 2.783882181 and -2.783882181.

Subproblem 1

m + -0.5 = 2.783882181 Simplifying m + -0.5 = 2.783882181 Reorder the terms: -0.5 + m = 2.783882181 Solving -0.5 + m = 2.783882181 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + m = 2.783882181 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + m = 2.783882181 + 0.5 m = 2.783882181 + 0.5 Combine like terms: 2.783882181 + 0.5 = 3.283882181 m = 3.283882181 Simplifying m = 3.283882181

Subproblem 2

m + -0.5 = -2.783882181 Simplifying m + -0.5 = -2.783882181 Reorder the terms: -0.5 + m = -2.783882181 Solving -0.5 + m = -2.783882181 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + m = -2.783882181 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + m = -2.783882181 + 0.5 m = -2.783882181 + 0.5 Combine like terms: -2.783882181 + 0.5 = -2.283882181 m = -2.283882181 Simplifying m = -2.283882181

Solution

The solution to the problem is based on the solutions from the subproblems. m = {3.283882181, -2.283882181}

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