-5m(m-3)+2(3m+1)=15-8

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Solution for -5m(m-3)+2(3m+1)=15-8 equation:


Simplifying
-5m(m + -3) + 2(3m + 1) = 15 + -8

Reorder the terms:
-5m(-3 + m) + 2(3m + 1) = 15 + -8
(-3 * -5m + m * -5m) + 2(3m + 1) = 15 + -8
(15m + -5m2) + 2(3m + 1) = 15 + -8

Reorder the terms:
15m + -5m2 + 2(1 + 3m) = 15 + -8
15m + -5m2 + (1 * 2 + 3m * 2) = 15 + -8
15m + -5m2 + (2 + 6m) = 15 + -8

Reorder the terms:
2 + 15m + 6m + -5m2 = 15 + -8

Combine like terms: 15m + 6m = 21m
2 + 21m + -5m2 = 15 + -8

Combine like terms: 15 + -8 = 7
2 + 21m + -5m2 = 7

Solving
2 + 21m + -5m2 = 7

Solving for variable 'm'.

Reorder the terms:
2 + -7 + 21m + -5m2 = 7 + -7

Combine like terms: 2 + -7 = -5
-5 + 21m + -5m2 = 7 + -7

Combine like terms: 7 + -7 = 0
-5 + 21m + -5m2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
1 + -4.2m + m2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -4.2m + -1 + m2 = 0 + -1

Reorder the terms:
1 + -1 + -4.2m + m2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -4.2m + m2 = 0 + -1
-4.2m + m2 = 0 + -1

Combine like terms: 0 + -1 = -1
-4.2m + m2 = -1

The m term is -4.2m.  Take half its coefficient (-2.1).
Square it (4.41) and add it to both sides.

Add '4.41' to each side of the equation.
-4.2m + 4.41 + m2 = -1 + 4.41

Reorder the terms:
4.41 + -4.2m + m2 = -1 + 4.41

Combine like terms: -1 + 4.41 = 3.41
4.41 + -4.2m + m2 = 3.41

Factor a perfect square on the left side:
(m + -2.1)(m + -2.1) = 3.41

Calculate the square root of the right side: 1.846618531

Break this problem into two subproblems by setting 
(m + -2.1) equal to 1.846618531 and -1.846618531.

Subproblem 1

m + -2.1 = 1.846618531 Simplifying m + -2.1 = 1.846618531 Reorder the terms: -2.1 + m = 1.846618531 Solving -2.1 + m = 1.846618531 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '2.1' to each side of the equation. -2.1 + 2.1 + m = 1.846618531 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + m = 1.846618531 + 2.1 m = 1.846618531 + 2.1 Combine like terms: 1.846618531 + 2.1 = 3.946618531 m = 3.946618531 Simplifying m = 3.946618531

Subproblem 2

m + -2.1 = -1.846618531 Simplifying m + -2.1 = -1.846618531 Reorder the terms: -2.1 + m = -1.846618531 Solving -2.1 + m = -1.846618531 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '2.1' to each side of the equation. -2.1 + 2.1 + m = -1.846618531 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + m = -1.846618531 + 2.1 m = -1.846618531 + 2.1 Combine like terms: -1.846618531 + 2.1 = 0.253381469 m = 0.253381469 Simplifying m = 0.253381469

Solution

The solution to the problem is based on the solutions from the subproblems. m = {3.946618531, 0.253381469}

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