2n(n)+33n-120=0

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Solution for 2n(n)+33n-120=0 equation:


Simplifying
2n(n) + 33n + -120 = 0

Multiply n * n
2n2 + 33n + -120 = 0

Reorder the terms:
-120 + 33n + 2n2 = 0

Solving
-120 + 33n + 2n2 = 0

Solving for variable 'n'.

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

Divide each side by '2'.
-60 + 16.5n + n2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 16.5n + 60 + n2 = 0 + 60

Reorder the terms:
-60 + 60 + 16.5n + n2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 16.5n + n2 = 0 + 60
16.5n + n2 = 0 + 60

Combine like terms: 0 + 60 = 60
16.5n + n2 = 60

The n term is 16.5n.  Take half its coefficient (8.25).
Square it (68.0625) and add it to both sides.

Add '68.0625' to each side of the equation.
16.5n + 68.0625 + n2 = 60 + 68.0625

Reorder the terms:
68.0625 + 16.5n + n2 = 60 + 68.0625

Combine like terms: 60 + 68.0625 = 128.0625
68.0625 + 16.5n + n2 = 128.0625

Factor a perfect square on the left side:
(n + 8.25)(n + 8.25) = 128.0625

Calculate the square root of the right side: 11.316470298

Break this problem into two subproblems by setting 
(n + 8.25) equal to 11.316470298 and -11.316470298.

Subproblem 1

n + 8.25 = 11.316470298 Simplifying n + 8.25 = 11.316470298 Reorder the terms: 8.25 + n = 11.316470298 Solving 8.25 + n = 11.316470298 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-8.25' to each side of the equation. 8.25 + -8.25 + n = 11.316470298 + -8.25 Combine like terms: 8.25 + -8.25 = 0.00 0.00 + n = 11.316470298 + -8.25 n = 11.316470298 + -8.25 Combine like terms: 11.316470298 + -8.25 = 3.066470298 n = 3.066470298 Simplifying n = 3.066470298

Subproblem 2

n + 8.25 = -11.316470298 Simplifying n + 8.25 = -11.316470298 Reorder the terms: 8.25 + n = -11.316470298 Solving 8.25 + n = -11.316470298 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-8.25' to each side of the equation. 8.25 + -8.25 + n = -11.316470298 + -8.25 Combine like terms: 8.25 + -8.25 = 0.00 0.00 + n = -11.316470298 + -8.25 n = -11.316470298 + -8.25 Combine like terms: -11.316470298 + -8.25 = -19.566470298 n = -19.566470298 Simplifying n = -19.566470298

Solution

The solution to the problem is based on the solutions from the subproblems. n = {3.066470298, -19.566470298}

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