n^2+8n-11=5

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Solution for n^2+8n-11=5 equation:


Simplifying
n2 + 8n + -11 = 5

Reorder the terms:
-11 + 8n + n2 = 5

Solving
-11 + 8n + n2 = 5

Solving for variable 'n'.

Reorder the terms:
-11 + -5 + 8n + n2 = 5 + -5

Combine like terms: -11 + -5 = -16
-16 + 8n + n2 = 5 + -5

Combine like terms: 5 + -5 = 0
-16 + 8n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 8n + 16 + n2 = 0 + 16

Reorder the terms:
-16 + 16 + 8n + n2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 8n + n2 = 0 + 16
8n + n2 = 0 + 16

Combine like terms: 0 + 16 = 16
8n + n2 = 16

The n term is 8n.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8n + 16 + n2 = 16 + 16

Reorder the terms:
16 + 8n + n2 = 16 + 16

Combine like terms: 16 + 16 = 32
16 + 8n + n2 = 32

Factor a perfect square on the left side:
(n + 4)(n + 4) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(n + 4) equal to 5.656854249 and -5.656854249.

Subproblem 1

n + 4 = 5.656854249 Simplifying n + 4 = 5.656854249 Reorder the terms: 4 + n = 5.656854249 Solving 4 + n = 5.656854249 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + n = 5.656854249 + -4 Combine like terms: 4 + -4 = 0 0 + n = 5.656854249 + -4 n = 5.656854249 + -4 Combine like terms: 5.656854249 + -4 = 1.656854249 n = 1.656854249 Simplifying n = 1.656854249

Subproblem 2

n + 4 = -5.656854249 Simplifying n + 4 = -5.656854249 Reorder the terms: 4 + n = -5.656854249 Solving 4 + n = -5.656854249 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + n = -5.656854249 + -4 Combine like terms: 4 + -4 = 0 0 + n = -5.656854249 + -4 n = -5.656854249 + -4 Combine like terms: -5.656854249 + -4 = -9.656854249 n = -9.656854249 Simplifying n = -9.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. n = {1.656854249, -9.656854249}

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