n^2+2n-255=0

Solution for n^2+2n-255=0 equation:

Simplifying
n2 + 2n + -255 = 0

Reorder the terms:
-255 + 2n + n2 = 0

Solving
-255 + 2n + n2 = 0

Solving for variable 'n'.

Factor a trinomial.
(-17 + -1n)(15 + -1n) = 0

Subproblem 1
Set the factor '(-17 + -1n)' equal to zero and attempt to solve:

Simplifying
-17 + -1n = 0

Solving
-17 + -1n = 0

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

Add '17' to each side of the equation.
-17 + 17 + -1n = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -1n = 0 + 17
-1n = 0 + 17

Combine like terms: 0 + 17 = 17
-1n = 17

Divide each side by '-1'.
n = -17

Simplifying
n = -17
Subproblem 2
Set the factor '(15 + -1n)' equal to zero and attempt to solve:

Simplifying
15 + -1n = 0

Solving
15 + -1n = 0

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

Add '-15' to each side of the equation.
15 + -15 + -1n = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -1n = 0 + -15
-1n = 0 + -15

Combine like terms: 0 + -15 = -15
-1n = -15

Divide each side by '-1'.
n = 15

Simplifying
n = 15
Solution
n = {-17, 15}