n^2-2n-35=7

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Solution for n^2-2n-35=7 equation:


Simplifying
n2 + -2n + -35 = 7

Reorder the terms:
-35 + -2n + n2 = 7

Solving
-35 + -2n + n2 = 7

Solving for variable 'n'.

Reorder the terms:
-35 + -7 + -2n + n2 = 7 + -7

Combine like terms: -35 + -7 = -42
-42 + -2n + n2 = 7 + -7

Combine like terms: 7 + -7 = 0
-42 + -2n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '42' to each side of the equation.
-42 + -2n + 42 + n2 = 0 + 42

Reorder the terms:
-42 + 42 + -2n + n2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + -2n + n2 = 0 + 42
-2n + n2 = 0 + 42

Combine like terms: 0 + 42 = 42
-2n + n2 = 42

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 = 42 + 1

Reorder the terms:
1 + -2n + n2 = 42 + 1

Combine like terms: 42 + 1 = 43
1 + -2n + n2 = 43

Factor a perfect square on the left side:
(n + -1)(n + -1) = 43

Calculate the square root of the right side: 6.557438524

Break this problem into two subproblems by setting 
(n + -1) equal to 6.557438524 and -6.557438524.

Subproblem 1

n + -1 = 6.557438524 Simplifying n + -1 = 6.557438524 Reorder the terms: -1 + n = 6.557438524 Solving -1 + n = 6.557438524 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 = 6.557438524 + 1 Combine like terms: -1 + 1 = 0 0 + n = 6.557438524 + 1 n = 6.557438524 + 1 Combine like terms: 6.557438524 + 1 = 7.557438524 n = 7.557438524 Simplifying n = 7.557438524

Subproblem 2

n + -1 = -6.557438524 Simplifying n + -1 = -6.557438524 Reorder the terms: -1 + n = -6.557438524 Solving -1 + n = -6.557438524 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 = -6.557438524 + 1 Combine like terms: -1 + 1 = 0 0 + n = -6.557438524 + 1 n = -6.557438524 + 1 Combine like terms: -6.557438524 + 1 = -5.557438524 n = -5.557438524 Simplifying n = -5.557438524

Solution

The solution to the problem is based on the solutions from the subproblems. n = {7.557438524, -5.557438524}

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