n^2-2n-8=40

Solution for n^2-2n-8=40 equation:

Simplifying
n2 + -2n + -8 = 40

Reorder the terms:
-8 + -2n + n2 = 40

Solving
-8 + -2n + n2 = 40

Solving for variable 'n'.

Reorder the terms:
-8 + -40 + -2n + n2 = 40 + -40

Combine like terms: -8 + -40 = -48
-48 + -2n + n2 = 40 + -40

Combine like terms: 40 + -40 = 0
-48 + -2n + n2 = 0

Factor a trinomial.
(-6 + -1n)(8 + -1n) = 0

Subproblem 1
Set the factor '(-6 + -1n)' equal to zero and attempt to solve:

Simplifying
-6 + -1n = 0

Solving
-6 + -1n = 0

Move all terms containing n to the left, all other terms to the right.

Add '6' to each side of the equation.
-6 + 6 + -1n = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1n = 0 + 6
-1n = 0 + 6

Combine like terms: 0 + 6 = 6
-1n = 6

Divide each side by '-1'.
n = -6

Simplifying
n = -6
Subproblem 2
Set the factor '(8 + -1n)' equal to zero and attempt to solve:

Simplifying
8 + -1n = 0

Solving
8 + -1n = 0

Move all terms containing n to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + -1n = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1n = 0 + -8
-1n = 0 + -8

Combine like terms: 0 + -8 = -8
-1n = -8

Divide each side by '-1'.
n = 8

Simplifying
n = 8
Solution
n = {-6, 8}