(n*n)+20n-440=0

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Solution for (n*n)+20n-440=0 equation:


Simplifying
(n * n) + 20n + -440 = 0

Multiply n * n
(n2) + 20n + -440 = 0
n2 + 20n + -440 = 0

Reorder the terms:
-440 + 20n + n2 = 0

Solving
-440 + 20n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '440' to each side of the equation.
-440 + 20n + 440 + n2 = 0 + 440

Reorder the terms:
-440 + 440 + 20n + n2 = 0 + 440

Combine like terms: -440 + 440 = 0
0 + 20n + n2 = 0 + 440
20n + n2 = 0 + 440

Combine like terms: 0 + 440 = 440
20n + n2 = 440

The n term is 20n.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20n + 100 + n2 = 440 + 100

Reorder the terms:
100 + 20n + n2 = 440 + 100

Combine like terms: 440 + 100 = 540
100 + 20n + n2 = 540

Factor a perfect square on the left side:
(n + 10)(n + 10) = 540

Calculate the square root of the right side: 23.237900077

Break this problem into two subproblems by setting 
(n + 10) equal to 23.237900077 and -23.237900077.

Subproblem 1

n + 10 = 23.237900077 Simplifying n + 10 = 23.237900077 Reorder the terms: 10 + n = 23.237900077 Solving 10 + n = 23.237900077 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + n = 23.237900077 + -10 Combine like terms: 10 + -10 = 0 0 + n = 23.237900077 + -10 n = 23.237900077 + -10 Combine like terms: 23.237900077 + -10 = 13.237900077 n = 13.237900077 Simplifying n = 13.237900077

Subproblem 2

n + 10 = -23.237900077 Simplifying n + 10 = -23.237900077 Reorder the terms: 10 + n = -23.237900077 Solving 10 + n = -23.237900077 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + n = -23.237900077 + -10 Combine like terms: 10 + -10 = 0 0 + n = -23.237900077 + -10 n = -23.237900077 + -10 Combine like terms: -23.237900077 + -10 = -33.237900077 n = -33.237900077 Simplifying n = -33.237900077

Solution

The solution to the problem is based on the solutions from the subproblems. n = {13.237900077, -33.237900077}

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