-2m(1+4m)5=-13

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Solution for -2m(1+4m)5=-13 equation:


Simplifying
-2m(1 + 4m) * 5 = -13

Reorder the terms for easier multiplication:
-2 * 5m(1 + 4m) = -13

Multiply -2 * 5
-10m(1 + 4m) = -13
(1 * -10m + 4m * -10m) = -13
(-10m + -40m2) = -13

Solving
-10m + -40m2 = -13

Solving for variable 'm'.

Reorder the terms:
13 + -10m + -40m2 = -13 + 13

Combine like terms: -13 + 13 = 0
13 + -10m + -40m2 = 0

Begin completing the square.  Divide all terms by
-40 the coefficient of the squared term: 

Divide each side by '-40'.
-0.325 + 0.25m + m2 = 0.0

Move the constant term to the right:

Add '0.325' to each side of the equation.
-0.325 + 0.25m + 0.325 + m2 = 0.0 + 0.325

Reorder the terms:
-0.325 + 0.325 + 0.25m + m2 = 0.0 + 0.325

Combine like terms: -0.325 + 0.325 = 0.000
0.000 + 0.25m + m2 = 0.0 + 0.325
0.25m + m2 = 0.0 + 0.325

Combine like terms: 0.0 + 0.325 = 0.325
0.25m + m2 = 0.325

The m term is 0.25m.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25m + 0.015625 + m2 = 0.325 + 0.015625

Reorder the terms:
0.015625 + 0.25m + m2 = 0.325 + 0.015625

Combine like terms: 0.325 + 0.015625 = 0.340625
0.015625 + 0.25m + m2 = 0.340625

Factor a perfect square on the left side:
(m + 0.125)(m + 0.125) = 0.340625

Calculate the square root of the right side: 0.583630876

Break this problem into two subproblems by setting 
(m + 0.125) equal to 0.583630876 and -0.583630876.

Subproblem 1

m + 0.125 = 0.583630876 Simplifying m + 0.125 = 0.583630876 Reorder the terms: 0.125 + m = 0.583630876 Solving 0.125 + m = 0.583630876 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + m = 0.583630876 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + m = 0.583630876 + -0.125 m = 0.583630876 + -0.125 Combine like terms: 0.583630876 + -0.125 = 0.458630876 m = 0.458630876 Simplifying m = 0.458630876

Subproblem 2

m + 0.125 = -0.583630876 Simplifying m + 0.125 = -0.583630876 Reorder the terms: 0.125 + m = -0.583630876 Solving 0.125 + m = -0.583630876 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + m = -0.583630876 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + m = -0.583630876 + -0.125 m = -0.583630876 + -0.125 Combine like terms: -0.583630876 + -0.125 = -0.708630876 m = -0.708630876 Simplifying m = -0.708630876

Solution

The solution to the problem is based on the solutions from the subproblems. m = {0.458630876, -0.708630876}

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