5n^2+18n+12=0

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Solution for 5n^2+18n+12=0 equation:


Simplifying
5n2 + 18n + 12 = 0

Reorder the terms:
12 + 18n + 5n2 = 0

Solving
12 + 18n + 5n2 = 0

Solving for variable 'n'.

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

Divide each side by '5'.
2.4 + 3.6n + n2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + 3.6n + -2.4 + n2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + 3.6n + n2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + 3.6n + n2 = 0 + -2.4
3.6n + n2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
3.6n + n2 = -2.4

The n term is 3.6n.  Take half its coefficient (1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
3.6n + 3.24 + n2 = -2.4 + 3.24

Reorder the terms:
3.24 + 3.6n + n2 = -2.4 + 3.24

Combine like terms: -2.4 + 3.24 = 0.84
3.24 + 3.6n + n2 = 0.84

Factor a perfect square on the left side:
(n + 1.8)(n + 1.8) = 0.84

Calculate the square root of the right side: 0.916515139

Break this problem into two subproblems by setting 
(n + 1.8) equal to 0.916515139 and -0.916515139.

Subproblem 1

n + 1.8 = 0.916515139 Simplifying n + 1.8 = 0.916515139 Reorder the terms: 1.8 + n = 0.916515139 Solving 1.8 + n = 0.916515139 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + n = 0.916515139 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + n = 0.916515139 + -1.8 n = 0.916515139 + -1.8 Combine like terms: 0.916515139 + -1.8 = -0.883484861 n = -0.883484861 Simplifying n = -0.883484861

Subproblem 2

n + 1.8 = -0.916515139 Simplifying n + 1.8 = -0.916515139 Reorder the terms: 1.8 + n = -0.916515139 Solving 1.8 + n = -0.916515139 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + n = -0.916515139 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + n = -0.916515139 + -1.8 n = -0.916515139 + -1.8 Combine like terms: -0.916515139 + -1.8 = -2.716515139 n = -2.716515139 Simplifying n = -2.716515139

Solution

The solution to the problem is based on the solutions from the subproblems. n = {-0.883484861, -2.716515139}

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