n^2+2n=1200

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Solution for n^2+2n=1200 equation:


Simplifying
n2 + 2n = 1200

Reorder the terms:
2n + n2 = 1200

Solving
2n + n2 = 1200

Solving for variable 'n'.

Reorder the terms:
-1200 + 2n + n2 = 1200 + -1200

Combine like terms: 1200 + -1200 = 0
-1200 + 2n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1200' to each side of the equation.
-1200 + 2n + 1200 + n2 = 0 + 1200

Reorder the terms:
-1200 + 1200 + 2n + n2 = 0 + 1200

Combine like terms: -1200 + 1200 = 0
0 + 2n + n2 = 0 + 1200
2n + n2 = 0 + 1200

Combine like terms: 0 + 1200 = 1200
2n + n2 = 1200

The n term is 2n.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2n + 1 + n2 = 1200 + 1

Reorder the terms:
1 + 2n + n2 = 1200 + 1

Combine like terms: 1200 + 1 = 1201
1 + 2n + n2 = 1201

Factor a perfect square on the left side:
(n + 1)(n + 1) = 1201

Calculate the square root of the right side: 34.655446902

Break this problem into two subproblems by setting 
(n + 1) equal to 34.655446902 and -34.655446902.

Subproblem 1

n + 1 = 34.655446902 Simplifying n + 1 = 34.655446902 Reorder the terms: 1 + n = 34.655446902 Solving 1 + n = 34.655446902 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + n = 34.655446902 + -1 Combine like terms: 1 + -1 = 0 0 + n = 34.655446902 + -1 n = 34.655446902 + -1 Combine like terms: 34.655446902 + -1 = 33.655446902 n = 33.655446902 Simplifying n = 33.655446902

Subproblem 2

n + 1 = -34.655446902 Simplifying n + 1 = -34.655446902 Reorder the terms: 1 + n = -34.655446902 Solving 1 + n = -34.655446902 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + n = -34.655446902 + -1 Combine like terms: 1 + -1 = 0 0 + n = -34.655446902 + -1 n = -34.655446902 + -1 Combine like terms: -34.655446902 + -1 = -35.655446902 n = -35.655446902 Simplifying n = -35.655446902

Solution

The solution to the problem is based on the solutions from the subproblems. n = {33.655446902, -35.655446902}

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