2n^2-2n-15=9

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Solution for 2n^2-2n-15=9 equation:


Simplifying
2n2 + -2n + -15 = 9

Reorder the terms:
-15 + -2n + 2n2 = 9

Solving
-15 + -2n + 2n2 = 9

Solving for variable 'n'.

Reorder the terms:
-15 + -9 + -2n + 2n2 = 9 + -9

Combine like terms: -15 + -9 = -24
-24 + -2n + 2n2 = 9 + -9

Combine like terms: 9 + -9 = 0
-24 + -2n + 2n2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-12 + -1n + n2) = 0

Factor a trinomial.
2((-3 + -1n)(4 + -1n)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-3 + -1n)' equal to zero and attempt to solve: Simplifying -3 + -1n = 0 Solving -3 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1n = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1n = 0 + 3 -1n = 0 + 3 Combine like terms: 0 + 3 = 3 -1n = 3 Divide each side by '-1'. n = -3 Simplifying n = -3

Subproblem 2

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

Solution

n = {-3, 4}

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