(12+n)*(13+n)=200

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Solution for (12+n)*(13+n)=200 equation:


Simplifying
(12 + n)(13 + n) = 200

Multiply (12 + n) * (13 + n)
(12(13 + n) + n(13 + n)) = 200
((13 * 12 + n * 12) + n(13 + n)) = 200
((156 + 12n) + n(13 + n)) = 200
(156 + 12n + (13 * n + n * n)) = 200
(156 + 12n + (13n + n2)) = 200

Combine like terms: 12n + 13n = 25n
(156 + 25n + n2) = 200

Solving
156 + 25n + n2 = 200

Solving for variable 'n'.

Reorder the terms:
156 + -200 + 25n + n2 = 200 + -200

Combine like terms: 156 + -200 = -44
-44 + 25n + n2 = 200 + -200

Combine like terms: 200 + -200 = 0
-44 + 25n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '44' to each side of the equation.
-44 + 25n + 44 + n2 = 0 + 44

Reorder the terms:
-44 + 44 + 25n + n2 = 0 + 44

Combine like terms: -44 + 44 = 0
0 + 25n + n2 = 0 + 44
25n + n2 = 0 + 44

Combine like terms: 0 + 44 = 44
25n + n2 = 44

The n term is 25n.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25n + 156.25 + n2 = 44 + 156.25

Reorder the terms:
156.25 + 25n + n2 = 44 + 156.25

Combine like terms: 44 + 156.25 = 200.25
156.25 + 25n + n2 = 200.25

Factor a perfect square on the left side:
(n + 12.5)(n + 12.5) = 200.25

Calculate the square root of the right side: 14.150971698

Break this problem into two subproblems by setting 
(n + 12.5) equal to 14.150971698 and -14.150971698.

Subproblem 1

n + 12.5 = 14.150971698 Simplifying n + 12.5 = 14.150971698 Reorder the terms: 12.5 + n = 14.150971698 Solving 12.5 + n = 14.150971698 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + n = 14.150971698 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + n = 14.150971698 + -12.5 n = 14.150971698 + -12.5 Combine like terms: 14.150971698 + -12.5 = 1.650971698 n = 1.650971698 Simplifying n = 1.650971698

Subproblem 2

n + 12.5 = -14.150971698 Simplifying n + 12.5 = -14.150971698 Reorder the terms: 12.5 + n = -14.150971698 Solving 12.5 + n = -14.150971698 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + n = -14.150971698 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + n = -14.150971698 + -12.5 n = -14.150971698 + -12.5 Combine like terms: -14.150971698 + -12.5 = -26.650971698 n = -26.650971698 Simplifying n = -26.650971698

Solution

The solution to the problem is based on the solutions from the subproblems. n = {1.650971698, -26.650971698}

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