2m^2-3m-8=0

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Solution for 2m^2-3m-8=0 equation:


Simplifying
2m2 + -3m + -8 = 0

Reorder the terms:
-8 + -3m + 2m2 = 0

Solving
-8 + -3m + 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'.
-4 + -1.5m + m2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -1.5m + 4 + m2 = 0 + 4

Reorder the terms:
-4 + 4 + -1.5m + m2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1.5m + m2 = 0 + 4
-1.5m + m2 = 0 + 4

Combine like terms: 0 + 4 = 4
-1.5m + m2 = 4

The m term is -1.5m.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5m + 0.5625 + m2 = 4 + 0.5625

Reorder the terms:
0.5625 + -1.5m + m2 = 4 + 0.5625

Combine like terms: 4 + 0.5625 = 4.5625
0.5625 + -1.5m + m2 = 4.5625

Factor a perfect square on the left side:
(m + -0.75)(m + -0.75) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(m + -0.75) equal to 2.136000936 and -2.136000936.

Subproblem 1

m + -0.75 = 2.136000936 Simplifying m + -0.75 = 2.136000936 Reorder the terms: -0.75 + m = 2.136000936 Solving -0.75 + m = 2.136000936 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + m = 2.136000936 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + m = 2.136000936 + 0.75 m = 2.136000936 + 0.75 Combine like terms: 2.136000936 + 0.75 = 2.886000936 m = 2.886000936 Simplifying m = 2.886000936

Subproblem 2

m + -0.75 = -2.136000936 Simplifying m + -0.75 = -2.136000936 Reorder the terms: -0.75 + m = -2.136000936 Solving -0.75 + m = -2.136000936 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + m = -2.136000936 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + m = -2.136000936 + 0.75 m = -2.136000936 + 0.75 Combine like terms: -2.136000936 + 0.75 = -1.386000936 m = -1.386000936 Simplifying m = -1.386000936

Solution

The solution to the problem is based on the solutions from the subproblems. m = {2.886000936, -1.386000936}

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