n^2+18n-40=0

Solution for n^2+18n-40=0 equation:

Simplifying
n2 + 18n + -40 = 0

Reorder the terms:
-40 + 18n + n2 = 0

Solving
-40 + 18n + n2 = 0

Solving for variable 'n'.

Factor a trinomial.
(-20 + -1n)(2 + -1n) = 0

Subproblem 1
Set the factor '(-20 + -1n)' equal to zero and attempt to solve:

Simplifying
-20 + -1n = 0

Solving
-20 + -1n = 0

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

Add '20' to each side of the equation.
-20 + 20 + -1n = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -1n = 0 + 20
-1n = 0 + 20

Combine like terms: 0 + 20 = 20
-1n = 20

Divide each side by '-1'.
n = -20

Simplifying
n = -20
Subproblem 2
Set the factor '(2 + -1n)' equal to zero and attempt to solve:

Simplifying
2 + -1n = 0

Solving
2 + -1n = 0

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

Add '-2' to each side of the equation.
2 + -2 + -1n = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1n = 0 + -2
-1n = 0 + -2

Combine like terms: 0 + -2 = -2
-1n = -2

Divide each side by '-1'.
n = 2

Simplifying
n = 2
Solution
n = {-20, 2}