12m^2-21=5m

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Solution for 12m^2-21=5m equation:


Simplifying
12m2 + -21 = 5m

Reorder the terms:
-21 + 12m2 = 5m

Solving
-21 + 12m2 = 5m

Solving for variable 'm'.

Reorder the terms:
-21 + -5m + 12m2 = 5m + -5m

Combine like terms: 5m + -5m = 0
-21 + -5m + 12m2 = 0

Begin completing the square.  Divide all terms by
12 the coefficient of the squared term: 

Divide each side by '12'.
-1.75 + -0.4166666667m + m2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -0.4166666667m + 1.75 + m2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -0.4166666667m + m2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -0.4166666667m + m2 = 0 + 1.75
-0.4166666667m + m2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-0.4166666667m + m2 = 1.75

The m term is -0.4166666667m.  Take half its coefficient (-0.2083333334).
Square it (0.04340277781) and add it to both sides.

Add '0.04340277781' to each side of the equation.
-0.4166666667m + 0.04340277781 + m2 = 1.75 + 0.04340277781

Reorder the terms:
0.04340277781 + -0.4166666667m + m2 = 1.75 + 0.04340277781

Combine like terms: 1.75 + 0.04340277781 = 1.79340277781
0.04340277781 + -0.4166666667m + m2 = 1.79340277781

Factor a perfect square on the left side:
(m + -0.2083333334)(m + -0.2083333334) = 1.79340277781

Calculate the square root of the right side: 1.33917989

Break this problem into two subproblems by setting 
(m + -0.2083333334) equal to 1.33917989 and -1.33917989.

Subproblem 1

m + -0.2083333334 = 1.33917989 Simplifying m + -0.2083333334 = 1.33917989 Reorder the terms: -0.2083333334 + m = 1.33917989 Solving -0.2083333334 + m = 1.33917989 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.2083333334' to each side of the equation. -0.2083333334 + 0.2083333334 + m = 1.33917989 + 0.2083333334 Combine like terms: -0.2083333334 + 0.2083333334 = 0.0000000000 0.0000000000 + m = 1.33917989 + 0.2083333334 m = 1.33917989 + 0.2083333334 Combine like terms: 1.33917989 + 0.2083333334 = 1.5475132234 m = 1.5475132234 Simplifying m = 1.5475132234

Subproblem 2

m + -0.2083333334 = -1.33917989 Simplifying m + -0.2083333334 = -1.33917989 Reorder the terms: -0.2083333334 + m = -1.33917989 Solving -0.2083333334 + m = -1.33917989 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.2083333334' to each side of the equation. -0.2083333334 + 0.2083333334 + m = -1.33917989 + 0.2083333334 Combine like terms: -0.2083333334 + 0.2083333334 = 0.0000000000 0.0000000000 + m = -1.33917989 + 0.2083333334 m = -1.33917989 + 0.2083333334 Combine like terms: -1.33917989 + 0.2083333334 = -1.1308465566 m = -1.1308465566 Simplifying m = -1.1308465566

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.5475132234, -1.1308465566}

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