n^2-2n-18=8

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Solution for n^2-2n-18=8 equation:


Simplifying
n2 + -2n + -18 = 8

Reorder the terms:
-18 + -2n + n2 = 8

Solving
-18 + -2n + n2 = 8

Solving for variable 'n'.

Reorder the terms:
-18 + -8 + -2n + n2 = 8 + -8

Combine like terms: -18 + -8 = -26
-26 + -2n + n2 = 8 + -8

Combine like terms: 8 + -8 = 0
-26 + -2n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + -2n + 26 + n2 = 0 + 26

Reorder the terms:
-26 + 26 + -2n + n2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + -2n + n2 = 0 + 26
-2n + n2 = 0 + 26

Combine like terms: 0 + 26 = 26
-2n + n2 = 26

The n term is -2n.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2n + 1 + n2 = 26 + 1

Reorder the terms:
1 + -2n + n2 = 26 + 1

Combine like terms: 26 + 1 = 27
1 + -2n + n2 = 27

Factor a perfect square on the left side:
(n + -1)(n + -1) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(n + -1) equal to 5.196152423 and -5.196152423.

Subproblem 1

n + -1 = 5.196152423 Simplifying n + -1 = 5.196152423 Reorder the terms: -1 + n = 5.196152423 Solving -1 + n = 5.196152423 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = 5.196152423 + 1 Combine like terms: -1 + 1 = 0 0 + n = 5.196152423 + 1 n = 5.196152423 + 1 Combine like terms: 5.196152423 + 1 = 6.196152423 n = 6.196152423 Simplifying n = 6.196152423

Subproblem 2

n + -1 = -5.196152423 Simplifying n + -1 = -5.196152423 Reorder the terms: -1 + n = -5.196152423 Solving -1 + n = -5.196152423 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + n = -5.196152423 + 1 Combine like terms: -1 + 1 = 0 0 + n = -5.196152423 + 1 n = -5.196152423 + 1 Combine like terms: -5.196152423 + 1 = -4.196152423 n = -4.196152423 Simplifying n = -4.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. n = {6.196152423, -4.196152423}

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