2m(m+5)=47

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Solution for 2m(m+5)=47 equation:


Simplifying
2m(m + 5) = 47

Reorder the terms:
2m(5 + m) = 47
(5 * 2m + m * 2m) = 47
(10m + 2m2) = 47

Solving
10m + 2m2 = 47

Solving for variable 'm'.

Reorder the terms:
-47 + 10m + 2m2 = 47 + -47

Combine like terms: 47 + -47 = 0
-47 + 10m + 2m2 = 0

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

Divide each side by '2'.
-23.5 + 5m + m2 = 0

Move the constant term to the right:

Add '23.5' to each side of the equation.
-23.5 + 5m + 23.5 + m2 = 0 + 23.5

Reorder the terms:
-23.5 + 23.5 + 5m + m2 = 0 + 23.5

Combine like terms: -23.5 + 23.5 = 0.0
0.0 + 5m + m2 = 0 + 23.5
5m + m2 = 0 + 23.5

Combine like terms: 0 + 23.5 = 23.5
5m + m2 = 23.5

The m term is 5m.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5m + 6.25 + m2 = 23.5 + 6.25

Reorder the terms:
6.25 + 5m + m2 = 23.5 + 6.25

Combine like terms: 23.5 + 6.25 = 29.75
6.25 + 5m + m2 = 29.75

Factor a perfect square on the left side:
(m + 2.5)(m + 2.5) = 29.75

Calculate the square root of the right side: 5.454356057

Break this problem into two subproblems by setting 
(m + 2.5) equal to 5.454356057 and -5.454356057.

Subproblem 1

m + 2.5 = 5.454356057 Simplifying m + 2.5 = 5.454356057 Reorder the terms: 2.5 + m = 5.454356057 Solving 2.5 + m = 5.454356057 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + m = 5.454356057 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + m = 5.454356057 + -2.5 m = 5.454356057 + -2.5 Combine like terms: 5.454356057 + -2.5 = 2.954356057 m = 2.954356057 Simplifying m = 2.954356057

Subproblem 2

m + 2.5 = -5.454356057 Simplifying m + 2.5 = -5.454356057 Reorder the terms: 2.5 + m = -5.454356057 Solving 2.5 + m = -5.454356057 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + m = -5.454356057 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + m = -5.454356057 + -2.5 m = -5.454356057 + -2.5 Combine like terms: -5.454356057 + -2.5 = -7.954356057 m = -7.954356057 Simplifying m = -7.954356057

Solution

The solution to the problem is based on the solutions from the subproblems. m = {2.954356057, -7.954356057}

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