0=-n^2+n+20

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Solution for 0=-n^2+n+20 equation:


Simplifying
0 = -1n2 + n + 20

Reorder the terms:
0 = 20 + n + -1n2

Solving
0 = 20 + n + -1n2

Solving for variable 'n'.

Combine like terms: 0 + -20 = -20
-20 + -1n + n2 = 20 + n + -1n2 + -20 + -1n + n2

Reorder the terms:
-20 + -1n + n2 = 20 + -20 + n + -1n + -1n2 + n2

Combine like terms: 20 + -20 = 0
-20 + -1n + n2 = 0 + n + -1n + -1n2 + n2
-20 + -1n + n2 = n + -1n + -1n2 + n2

Combine like terms: n + -1n = 0
-20 + -1n + n2 = 0 + -1n2 + n2
-20 + -1n + n2 = -1n2 + n2

Combine like terms: -1n2 + n2 = 0
-20 + -1n + n2 = 0

Factor a trinomial.
(-4 + -1n)(5 + -1n) = 0

Subproblem 1

Set the factor '(-4 + -1n)' equal to zero and attempt to solve: Simplifying -4 + -1n = 0 Solving -4 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1n = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1n = 0 + 4 -1n = 0 + 4 Combine like terms: 0 + 4 = 4 -1n = 4 Divide each side by '-1'. n = -4 Simplifying n = -4

Subproblem 2

Set the factor '(5 + -1n)' equal to zero and attempt to solve: Simplifying 5 + -1n = 0 Solving 5 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1n = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1n = 0 + -5 -1n = 0 + -5 Combine like terms: 0 + -5 = -5 -1n = -5 Divide each side by '-1'. n = 5 Simplifying n = 5

Solution

n = {-4, 5}

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