20n^2-99n=5n^2+42

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Solution for 20n^2-99n=5n^2+42 equation:


Simplifying
20n2 + -99n = 5n2 + 42

Reorder the terms:
-99n + 20n2 = 5n2 + 42

Reorder the terms:
-99n + 20n2 = 42 + 5n2

Solving
-99n + 20n2 = 42 + 5n2

Solving for variable 'n'.

Reorder the terms:
-42 + -99n + 20n2 + -5n2 = 42 + 5n2 + -42 + -5n2

Combine like terms: 20n2 + -5n2 = 15n2
-42 + -99n + 15n2 = 42 + 5n2 + -42 + -5n2

Reorder the terms:
-42 + -99n + 15n2 = 42 + -42 + 5n2 + -5n2

Combine like terms: 42 + -42 = 0
-42 + -99n + 15n2 = 0 + 5n2 + -5n2
-42 + -99n + 15n2 = 5n2 + -5n2

Combine like terms: 5n2 + -5n2 = 0
-42 + -99n + 15n2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-14 + -33n + 5n2) = 0

Factor a trinomial.
3((-2 + -5n)(7 + -1n)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-2 + -5n)' equal to zero and attempt to solve: Simplifying -2 + -5n = 0 Solving -2 + -5n = 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 + -5n = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -5n = 0 + 2 -5n = 0 + 2 Combine like terms: 0 + 2 = 2 -5n = 2 Divide each side by '-5'. n = -0.4 Simplifying n = -0.4

Subproblem 2

Set the factor '(7 + -1n)' equal to zero and attempt to solve: Simplifying 7 + -1n = 0 Solving 7 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1n = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1n = 0 + -7 -1n = 0 + -7 Combine like terms: 0 + -7 = -7 -1n = -7 Divide each side by '-1'. n = 7 Simplifying n = 7

Solution

n = {-0.4, 7}

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