Sn=9n-2n^2

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Solution for Sn=9n-2n^2 equation:


Simplifying
Sn = 9n + -2n2

Solving
nS = 9n + -2n2

Solving for variable 'n'.

Reorder the terms:
-9n + nS + 2n2 = 9n + -2n2 + -9n + 2n2

Reorder the terms:
-9n + nS + 2n2 = 9n + -9n + -2n2 + 2n2

Combine like terms: 9n + -9n = 0
-9n + nS + 2n2 = 0 + -2n2 + 2n2
-9n + nS + 2n2 = -2n2 + 2n2

Combine like terms: -2n2 + 2n2 = 0
-9n + nS + 2n2 = 0

Factor out the Greatest Common Factor (GCF), 'n'.
n(-9 + S + 2n) = 0

Subproblem 1

Set the factor 'n' equal to zero and attempt to solve: Simplifying n = 0 Solving n = 0 Move all terms containing n to the left, all other terms to the right. Simplifying n = 0

Subproblem 2

Set the factor '(-9 + S + 2n)' equal to zero and attempt to solve: Simplifying -9 + S + 2n = 0 Solving -9 + S + 2n = 0 Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + S + 9 + 2n = 0 + 9 Reorder the terms: -9 + 9 + S + 2n = 0 + 9 Combine like terms: -9 + 9 = 0 0 + S + 2n = 0 + 9 S + 2n = 0 + 9 Combine like terms: 0 + 9 = 9 S + 2n = 9 Add '-1S' to each side of the equation. S + -1S + 2n = 9 + -1S Combine like terms: S + -1S = 0 0 + 2n = 9 + -1S 2n = 9 + -1S Divide each side by '2'. n = 4.5 + -0.5S Simplifying n = 4.5 + -0.5S

Solution

n = {0, 4.5 + -0.5S}

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