-8n^2-3n+15=-8

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Solution for -8n^2-3n+15=-8 equation:


Simplifying
-8n2 + -3n + 15 = -8

Reorder the terms:
15 + -3n + -8n2 = -8

Solving
15 + -3n + -8n2 = -8

Solving for variable 'n'.

Reorder the terms:
15 + 8 + -3n + -8n2 = -8 + 8

Combine like terms: 15 + 8 = 23
23 + -3n + -8n2 = -8 + 8

Combine like terms: -8 + 8 = 0
23 + -3n + -8n2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-2.875 + 0.375n + n2 = 0

Move the constant term to the right:

Add '2.875' to each side of the equation.
-2.875 + 0.375n + 2.875 + n2 = 0 + 2.875

Reorder the terms:
-2.875 + 2.875 + 0.375n + n2 = 0 + 2.875

Combine like terms: -2.875 + 2.875 = 0.000
0.000 + 0.375n + n2 = 0 + 2.875
0.375n + n2 = 0 + 2.875

Combine like terms: 0 + 2.875 = 2.875
0.375n + n2 = 2.875

The n term is 0.375n.  Take half its coefficient (0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
0.375n + 0.03515625 + n2 = 2.875 + 0.03515625

Reorder the terms:
0.03515625 + 0.375n + n2 = 2.875 + 0.03515625

Combine like terms: 2.875 + 0.03515625 = 2.91015625
0.03515625 + 0.375n + n2 = 2.91015625

Factor a perfect square on the left side:
(n + 0.1875)(n + 0.1875) = 2.91015625

Calculate the square root of the right side: 1.705918008

Break this problem into two subproblems by setting 
(n + 0.1875) equal to 1.705918008 and -1.705918008.

Subproblem 1

n + 0.1875 = 1.705918008 Simplifying n + 0.1875 = 1.705918008 Reorder the terms: 0.1875 + n = 1.705918008 Solving 0.1875 + n = 1.705918008 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + n = 1.705918008 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + n = 1.705918008 + -0.1875 n = 1.705918008 + -0.1875 Combine like terms: 1.705918008 + -0.1875 = 1.518418008 n = 1.518418008 Simplifying n = 1.518418008

Subproblem 2

n + 0.1875 = -1.705918008 Simplifying n + 0.1875 = -1.705918008 Reorder the terms: 0.1875 + n = -1.705918008 Solving 0.1875 + n = -1.705918008 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + n = -1.705918008 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + n = -1.705918008 + -0.1875 n = -1.705918008 + -0.1875 Combine like terms: -1.705918008 + -0.1875 = -1.893418008 n = -1.893418008 Simplifying n = -1.893418008

Solution

The solution to the problem is based on the solutions from the subproblems. n = {1.518418008, -1.893418008}

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