10m(5m-9)=39

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Solution for 10m(5m-9)=39 equation:


Simplifying
10m(5m + -9) = 39

Reorder the terms:
10m(-9 + 5m) = 39
(-9 * 10m + 5m * 10m) = 39
(-90m + 50m2) = 39

Solving
-90m + 50m2 = 39

Solving for variable 'm'.

Reorder the terms:
-39 + -90m + 50m2 = 39 + -39

Combine like terms: 39 + -39 = 0
-39 + -90m + 50m2 = 0

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

Divide each side by '50'.
-0.78 + -1.8m + m2 = 0.0

Move the constant term to the right:

Add '0.78' to each side of the equation.
-0.78 + -1.8m + 0.78 + m2 = 0.0 + 0.78

Reorder the terms:
-0.78 + 0.78 + -1.8m + m2 = 0.0 + 0.78

Combine like terms: -0.78 + 0.78 = 0.00
0.00 + -1.8m + m2 = 0.0 + 0.78
-1.8m + m2 = 0.0 + 0.78

Combine like terms: 0.0 + 0.78 = 0.78
-1.8m + m2 = 0.78

The m term is -1.8m.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8m + 0.81 + m2 = 0.78 + 0.81

Reorder the terms:
0.81 + -1.8m + m2 = 0.78 + 0.81

Combine like terms: 0.78 + 0.81 = 1.59
0.81 + -1.8m + m2 = 1.59

Factor a perfect square on the left side:
(m + -0.9)(m + -0.9) = 1.59

Calculate the square root of the right side: 1.260952021

Break this problem into two subproblems by setting 
(m + -0.9) equal to 1.260952021 and -1.260952021.

Subproblem 1

m + -0.9 = 1.260952021 Simplifying m + -0.9 = 1.260952021 Reorder the terms: -0.9 + m = 1.260952021 Solving -0.9 + m = 1.260952021 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + m = 1.260952021 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + m = 1.260952021 + 0.9 m = 1.260952021 + 0.9 Combine like terms: 1.260952021 + 0.9 = 2.160952021 m = 2.160952021 Simplifying m = 2.160952021

Subproblem 2

m + -0.9 = -1.260952021 Simplifying m + -0.9 = -1.260952021 Reorder the terms: -0.9 + m = -1.260952021 Solving -0.9 + m = -1.260952021 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + m = -1.260952021 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + m = -1.260952021 + 0.9 m = -1.260952021 + 0.9 Combine like terms: -1.260952021 + 0.9 = -0.360952021 m = -0.360952021 Simplifying m = -0.360952021

Solution

The solution to the problem is based on the solutions from the subproblems. m = {2.160952021, -0.360952021}

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