n^2-2n-74=0

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Solution for n^2-2n-74=0 equation:


Simplifying
n2 + -2n + -74 = 0

Reorder the terms:
-74 + -2n + n2 = 0

Solving
-74 + -2n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '74' to each side of the equation.
-74 + -2n + 74 + n2 = 0 + 74

Reorder the terms:
-74 + 74 + -2n + n2 = 0 + 74

Combine like terms: -74 + 74 = 0
0 + -2n + n2 = 0 + 74
-2n + n2 = 0 + 74

Combine like terms: 0 + 74 = 74
-2n + n2 = 74

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 = 74 + 1

Reorder the terms:
1 + -2n + n2 = 74 + 1

Combine like terms: 74 + 1 = 75
1 + -2n + n2 = 75

Factor a perfect square on the left side:
(n + -1)(n + -1) = 75

Calculate the square root of the right side: 8.660254038

Break this problem into two subproblems by setting 
(n + -1) equal to 8.660254038 and -8.660254038.

Subproblem 1

n + -1 = 8.660254038 Simplifying n + -1 = 8.660254038 Reorder the terms: -1 + n = 8.660254038 Solving -1 + n = 8.660254038 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 = 8.660254038 + 1 Combine like terms: -1 + 1 = 0 0 + n = 8.660254038 + 1 n = 8.660254038 + 1 Combine like terms: 8.660254038 + 1 = 9.660254038 n = 9.660254038 Simplifying n = 9.660254038

Subproblem 2

n + -1 = -8.660254038 Simplifying n + -1 = -8.660254038 Reorder the terms: -1 + n = -8.660254038 Solving -1 + n = -8.660254038 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 = -8.660254038 + 1 Combine like terms: -1 + 1 = 0 0 + n = -8.660254038 + 1 n = -8.660254038 + 1 Combine like terms: -8.660254038 + 1 = -7.660254038 n = -7.660254038 Simplifying n = -7.660254038

Solution

The solution to the problem is based on the solutions from the subproblems. n = {9.660254038, -7.660254038}

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