9n^2-18n-42=-2

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Solution for 9n^2-18n-42=-2 equation:


Simplifying
9n2 + -18n + -42 = -2

Reorder the terms:
-42 + -18n + 9n2 = -2

Solving
-42 + -18n + 9n2 = -2

Solving for variable 'n'.

Reorder the terms:
-42 + 2 + -18n + 9n2 = -2 + 2

Combine like terms: -42 + 2 = -40
-40 + -18n + 9n2 = -2 + 2

Combine like terms: -2 + 2 = 0
-40 + -18n + 9n2 = 0

Factor a trinomial.
(-4 + -3n)(10 + -3n) = 0

Subproblem 1

Set the factor '(-4 + -3n)' equal to zero and attempt to solve: Simplifying -4 + -3n = 0 Solving -4 + -3n = 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 + -3n = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -3n = 0 + 4 -3n = 0 + 4 Combine like terms: 0 + 4 = 4 -3n = 4 Divide each side by '-3'. n = -1.333333333 Simplifying n = -1.333333333

Subproblem 2

Set the factor '(10 + -3n)' equal to zero and attempt to solve: Simplifying 10 + -3n = 0 Solving 10 + -3n = 0 Move all terms containing n to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -3n = 0 + -10 Combine like terms: 10 + -10 = 0 0 + -3n = 0 + -10 -3n = 0 + -10 Combine like terms: 0 + -10 = -10 -3n = -10 Divide each side by '-3'. n = 3.333333333 Simplifying n = 3.333333333

Solution

n = {-1.333333333, 3.333333333}

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