m(m+1)=200

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Solution for m(m+1)=200 equation:


Simplifying
m(m + 1) = 200

Reorder the terms:
m(1 + m) = 200
(1 * m + m * m) = 200
(1m + m2) = 200

Solving
1m + m2 = 200

Solving for variable 'm'.

Reorder the terms:
-200 + 1m + m2 = 200 + -200

Combine like terms: 200 + -200 = 0
-200 + 1m + m2 = 0

Begin completing the square.

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 1m + 200 + m2 = 0 + 200

Reorder the terms:
-200 + 200 + 1m + m2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 1m + m2 = 0 + 200
1m + m2 = 0 + 200

Combine like terms: 0 + 200 = 200
1m + m2 = 200

The m term is 1m.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
m + 0.25 + m2 = 200 + 0.25

Reorder the terms:
0.25 + m + m2 = 200 + 0.25

Combine like terms: 200 + 0.25 = 200.25
0.25 + m + m2 = 200.25

Factor a perfect square on the left side:
(m + 0.5)(m + 0.5) = 200.25

Calculate the square root of the right side: 14.150971698

Break this problem into two subproblems by setting 
(m + 0.5) equal to 14.150971698 and -14.150971698.

Subproblem 1

m + 0.5 = 14.150971698 Simplifying m + 0.5 = 14.150971698 Reorder the terms: 0.5 + m = 14.150971698 Solving 0.5 + m = 14.150971698 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + m = 14.150971698 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + m = 14.150971698 + -0.5 m = 14.150971698 + -0.5 Combine like terms: 14.150971698 + -0.5 = 13.650971698 m = 13.650971698 Simplifying m = 13.650971698

Subproblem 2

m + 0.5 = -14.150971698 Simplifying m + 0.5 = -14.150971698 Reorder the terms: 0.5 + m = -14.150971698 Solving 0.5 + m = -14.150971698 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + m = -14.150971698 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + m = -14.150971698 + -0.5 m = -14.150971698 + -0.5 Combine like terms: -14.150971698 + -0.5 = -14.650971698 m = -14.650971698 Simplifying m = -14.650971698

Solution

The solution to the problem is based on the solutions from the subproblems. m = {13.650971698, -14.650971698}

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