n^2-2n-15=102

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Solution for n^2-2n-15=102 equation:


Simplifying
n2 + -2n + -15 = 102

Reorder the terms:
-15 + -2n + n2 = 102

Solving
-15 + -2n + n2 = 102

Solving for variable 'n'.

Reorder the terms:
-15 + -102 + -2n + n2 = 102 + -102

Combine like terms: -15 + -102 = -117
-117 + -2n + n2 = 102 + -102

Combine like terms: 102 + -102 = 0
-117 + -2n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '117' to each side of the equation.
-117 + -2n + 117 + n2 = 0 + 117

Reorder the terms:
-117 + 117 + -2n + n2 = 0 + 117

Combine like terms: -117 + 117 = 0
0 + -2n + n2 = 0 + 117
-2n + n2 = 0 + 117

Combine like terms: 0 + 117 = 117
-2n + n2 = 117

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 = 117 + 1

Reorder the terms:
1 + -2n + n2 = 117 + 1

Combine like terms: 117 + 1 = 118
1 + -2n + n2 = 118

Factor a perfect square on the left side:
(n + -1)(n + -1) = 118

Calculate the square root of the right side: 10.862780491

Break this problem into two subproblems by setting 
(n + -1) equal to 10.862780491 and -10.862780491.

Subproblem 1

n + -1 = 10.862780491 Simplifying n + -1 = 10.862780491 Reorder the terms: -1 + n = 10.862780491 Solving -1 + n = 10.862780491 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 = 10.862780491 + 1 Combine like terms: -1 + 1 = 0 0 + n = 10.862780491 + 1 n = 10.862780491 + 1 Combine like terms: 10.862780491 + 1 = 11.862780491 n = 11.862780491 Simplifying n = 11.862780491

Subproblem 2

n + -1 = -10.862780491 Simplifying n + -1 = -10.862780491 Reorder the terms: -1 + n = -10.862780491 Solving -1 + n = -10.862780491 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 = -10.862780491 + 1 Combine like terms: -1 + 1 = 0 0 + n = -10.862780491 + 1 n = -10.862780491 + 1 Combine like terms: -10.862780491 + 1 = -9.862780491 n = -9.862780491 Simplifying n = -9.862780491

Solution

The solution to the problem is based on the solutions from the subproblems. n = {11.862780491, -9.862780491}

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