25=-2m(m-8)+5m

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Solution for 25=-2m(m-8)+5m equation:


Simplifying
25 = -2m(m + -8) + 5m

Reorder the terms:
25 = -2m(-8 + m) + 5m
25 = (-8 * -2m + m * -2m) + 5m
25 = (16m + -2m2) + 5m

Reorder the terms:
25 = 16m + 5m + -2m2

Combine like terms: 16m + 5m = 21m
25 = 21m + -2m2

Solving
25 = 21m + -2m2

Solving for variable 'm'.

Reorder the terms:
25 + -21m + 2m2 = 21m + -21m + -2m2 + 2m2

Combine like terms: 21m + -21m = 0
25 + -21m + 2m2 = 0 + -2m2 + 2m2
25 + -21m + 2m2 = -2m2 + 2m2

Combine like terms: -2m2 + 2m2 = 0
25 + -21m + 2m2 = 0

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

Divide each side by '2'.
12.5 + -10.5m + m2 = 0

Move the constant term to the right:

Add '-12.5' to each side of the equation.
12.5 + -10.5m + -12.5 + m2 = 0 + -12.5

Reorder the terms:
12.5 + -12.5 + -10.5m + m2 = 0 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
0.0 + -10.5m + m2 = 0 + -12.5
-10.5m + m2 = 0 + -12.5

Combine like terms: 0 + -12.5 = -12.5
-10.5m + m2 = -12.5

The m term is -10.5m.  Take half its coefficient (-5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
-10.5m + 27.5625 + m2 = -12.5 + 27.5625

Reorder the terms:
27.5625 + -10.5m + m2 = -12.5 + 27.5625

Combine like terms: -12.5 + 27.5625 = 15.0625
27.5625 + -10.5m + m2 = 15.0625

Factor a perfect square on the left side:
(m + -5.25)(m + -5.25) = 15.0625

Calculate the square root of the right side: 3.881043674

Break this problem into two subproblems by setting 
(m + -5.25) equal to 3.881043674 and -3.881043674.

Subproblem 1

m + -5.25 = 3.881043674 Simplifying m + -5.25 = 3.881043674 Reorder the terms: -5.25 + m = 3.881043674 Solving -5.25 + m = 3.881043674 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + m = 3.881043674 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + m = 3.881043674 + 5.25 m = 3.881043674 + 5.25 Combine like terms: 3.881043674 + 5.25 = 9.131043674 m = 9.131043674 Simplifying m = 9.131043674

Subproblem 2

m + -5.25 = -3.881043674 Simplifying m + -5.25 = -3.881043674 Reorder the terms: -5.25 + m = -3.881043674 Solving -5.25 + m = -3.881043674 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + m = -3.881043674 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + m = -3.881043674 + 5.25 m = -3.881043674 + 5.25 Combine like terms: -3.881043674 + 5.25 = 1.368956326 m = 1.368956326 Simplifying m = 1.368956326

Solution

The solution to the problem is based on the solutions from the subproblems. m = {9.131043674, 1.368956326}

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