n^2+18n+42=5

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Solution for n^2+18n+42=5 equation:


Simplifying
n2 + 18n + 42 = 5

Reorder the terms:
42 + 18n + n2 = 5

Solving
42 + 18n + n2 = 5

Solving for variable 'n'.

Reorder the terms:
42 + -5 + 18n + n2 = 5 + -5

Combine like terms: 42 + -5 = 37
37 + 18n + n2 = 5 + -5

Combine like terms: 5 + -5 = 0
37 + 18n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-37' to each side of the equation.
37 + 18n + -37 + n2 = 0 + -37

Reorder the terms:
37 + -37 + 18n + n2 = 0 + -37

Combine like terms: 37 + -37 = 0
0 + 18n + n2 = 0 + -37
18n + n2 = 0 + -37

Combine like terms: 0 + -37 = -37
18n + n2 = -37

The n term is 18n.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18n + 81 + n2 = -37 + 81

Reorder the terms:
81 + 18n + n2 = -37 + 81

Combine like terms: -37 + 81 = 44
81 + 18n + n2 = 44

Factor a perfect square on the left side:
(n + 9)(n + 9) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(n + 9) equal to 6.633249581 and -6.633249581.

Subproblem 1

n + 9 = 6.633249581 Simplifying n + 9 = 6.633249581 Reorder the terms: 9 + n = 6.633249581 Solving 9 + n = 6.633249581 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + n = 6.633249581 + -9 Combine like terms: 9 + -9 = 0 0 + n = 6.633249581 + -9 n = 6.633249581 + -9 Combine like terms: 6.633249581 + -9 = -2.366750419 n = -2.366750419 Simplifying n = -2.366750419

Subproblem 2

n + 9 = -6.633249581 Simplifying n + 9 = -6.633249581 Reorder the terms: 9 + n = -6.633249581 Solving 9 + n = -6.633249581 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + n = -6.633249581 + -9 Combine like terms: 9 + -9 = 0 0 + n = -6.633249581 + -9 n = -6.633249581 + -9 Combine like terms: -6.633249581 + -9 = -15.633249581 n = -15.633249581 Simplifying n = -15.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. n = {-2.366750419, -15.633249581}

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