2m^2-m-2-21=0

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Solution for 2m^2-m-2-21=0 equation:


Simplifying
2m2 + -1m + -2 + -21 = 0

Reorder the terms:
-2 + -21 + -1m + 2m2 = 0

Combine like terms: -2 + -21 = -23
-23 + -1m + 2m2 = 0

Solving
-23 + -1m + 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'.
-11.5 + -0.5m + m2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + -0.5m + 11.5 + m2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + -0.5m + m2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + -0.5m + m2 = 0 + 11.5
-0.5m + m2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
-0.5m + m2 = 11.5

The m term is -0.5m.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5m + 0.0625 + m2 = 11.5 + 0.0625

Reorder the terms:
0.0625 + -0.5m + m2 = 11.5 + 0.0625

Combine like terms: 11.5 + 0.0625 = 11.5625
0.0625 + -0.5m + m2 = 11.5625

Factor a perfect square on the left side:
(m + -0.25)(m + -0.25) = 11.5625

Calculate the square root of the right side: 3.400367627

Break this problem into two subproblems by setting 
(m + -0.25) equal to 3.400367627 and -3.400367627.

Subproblem 1

m + -0.25 = 3.400367627 Simplifying m + -0.25 = 3.400367627 Reorder the terms: -0.25 + m = 3.400367627 Solving -0.25 + m = 3.400367627 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + m = 3.400367627 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + m = 3.400367627 + 0.25 m = 3.400367627 + 0.25 Combine like terms: 3.400367627 + 0.25 = 3.650367627 m = 3.650367627 Simplifying m = 3.650367627

Subproblem 2

m + -0.25 = -3.400367627 Simplifying m + -0.25 = -3.400367627 Reorder the terms: -0.25 + m = -3.400367627 Solving -0.25 + m = -3.400367627 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + m = -3.400367627 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + m = -3.400367627 + 0.25 m = -3.400367627 + 0.25 Combine like terms: -3.400367627 + 0.25 = -3.150367627 m = -3.150367627 Simplifying m = -3.150367627

Solution

The solution to the problem is based on the solutions from the subproblems. m = {3.650367627, -3.150367627}

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