3n^2+2n-3900=0

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Solution for 3n^2+2n-3900=0 equation:


Simplifying
3n2 + 2n + -3900 = 0

Reorder the terms:
-3900 + 2n + 3n2 = 0

Solving
-3900 + 2n + 3n2 = 0

Solving for variable 'n'.

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

Divide each side by '3'.
-1300 + 0.6666666667n + n2 = 0

Move the constant term to the right:

Add '1300' to each side of the equation.
-1300 + 0.6666666667n + 1300 + n2 = 0 + 1300

Reorder the terms:
-1300 + 1300 + 0.6666666667n + n2 = 0 + 1300

Combine like terms: -1300 + 1300 = 0
0 + 0.6666666667n + n2 = 0 + 1300
0.6666666667n + n2 = 0 + 1300

Combine like terms: 0 + 1300 = 1300
0.6666666667n + n2 = 1300

The n term is 0.6666666667n.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667n + 0.1111111112 + n2 = 1300 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667n + n2 = 1300 + 0.1111111112

Combine like terms: 1300 + 0.1111111112 = 1300.1111111112
0.1111111112 + 0.6666666667n + n2 = 1300.1111111112

Factor a perfect square on the left side:
(n + 0.3333333334)(n + 0.3333333334) = 1300.1111111112

Calculate the square root of the right side: 36.057053556

Break this problem into two subproblems by setting 
(n + 0.3333333334) equal to 36.057053556 and -36.057053556.

Subproblem 1

n + 0.3333333334 = 36.057053556 Simplifying n + 0.3333333334 = 36.057053556 Reorder the terms: 0.3333333334 + n = 36.057053556 Solving 0.3333333334 + n = 36.057053556 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + n = 36.057053556 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + n = 36.057053556 + -0.3333333334 n = 36.057053556 + -0.3333333334 Combine like terms: 36.057053556 + -0.3333333334 = 35.7237202226 n = 35.7237202226 Simplifying n = 35.7237202226

Subproblem 2

n + 0.3333333334 = -36.057053556 Simplifying n + 0.3333333334 = -36.057053556 Reorder the terms: 0.3333333334 + n = -36.057053556 Solving 0.3333333334 + n = -36.057053556 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + n = -36.057053556 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + n = -36.057053556 + -0.3333333334 n = -36.057053556 + -0.3333333334 Combine like terms: -36.057053556 + -0.3333333334 = -36.3903868894 n = -36.3903868894 Simplifying n = -36.3903868894

Solution

The solution to the problem is based on the solutions from the subproblems. n = {35.7237202226, -36.3903868894}

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