3x^2=39x-120

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Solution for 3x^2=39x-120 equation:


Simplifying
3x2 = 39x + -120

Reorder the terms:
3x2 = -120 + 39x

Solving
3x2 = -120 + 39x

Solving for variable 'x'.

Reorder the terms:
120 + -39x + 3x2 = -120 + 39x + 120 + -39x

Reorder the terms:
120 + -39x + 3x2 = -120 + 120 + 39x + -39x

Combine like terms: -120 + 120 = 0
120 + -39x + 3x2 = 0 + 39x + -39x
120 + -39x + 3x2 = 39x + -39x

Combine like terms: 39x + -39x = 0
120 + -39x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(40 + -13x + x2) = 0

Factor a trinomial.
3((5 + -1x)(8 + -1x)) = 0

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

Set the factor '(8 + -1x)' equal to zero and attempt to solve: Simplifying 8 + -1x = 0 Solving 8 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1x = 0 + -8 -1x = 0 + -8 Combine like terms: 0 + -8 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8

Solution

x = {5, 8}

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