n^2+8n-64=0

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Solution for n^2+8n-64=0 equation:


Simplifying
n2 + 8n + -64 = 0

Reorder the terms:
-64 + 8n + n2 = 0

Solving
-64 + 8n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + 8n + 64 + n2 = 0 + 64

Reorder the terms:
-64 + 64 + 8n + n2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + 8n + n2 = 0 + 64
8n + n2 = 0 + 64

Combine like terms: 0 + 64 = 64
8n + n2 = 64

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 = 64 + 16

Reorder the terms:
16 + 8n + n2 = 64 + 16

Combine like terms: 64 + 16 = 80
16 + 8n + n2 = 80

Factor a perfect square on the left side:
(n + 4)(n + 4) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(n + 4) equal to 8.94427191 and -8.94427191.

Subproblem 1

n + 4 = 8.94427191 Simplifying n + 4 = 8.94427191 Reorder the terms: 4 + n = 8.94427191 Solving 4 + n = 8.94427191 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 = 8.94427191 + -4 Combine like terms: 4 + -4 = 0 0 + n = 8.94427191 + -4 n = 8.94427191 + -4 Combine like terms: 8.94427191 + -4 = 4.94427191 n = 4.94427191 Simplifying n = 4.94427191

Subproblem 2

n + 4 = -8.94427191 Simplifying n + 4 = -8.94427191 Reorder the terms: 4 + n = -8.94427191 Solving 4 + n = -8.94427191 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 = -8.94427191 + -4 Combine like terms: 4 + -4 = 0 0 + n = -8.94427191 + -4 n = -8.94427191 + -4 Combine like terms: -8.94427191 + -4 = -12.94427191 n = -12.94427191 Simplifying n = -12.94427191

Solution

The solution to the problem is based on the solutions from the subproblems. n = {4.94427191, -12.94427191}

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