5x^2-15x+18=2x^2+6x-12

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Solution for 5x^2-15x+18=2x^2+6x-12 equation:


Simplifying
5x2 + -15x + 18 = 2x2 + 6x + -12

Reorder the terms:
18 + -15x + 5x2 = 2x2 + 6x + -12

Reorder the terms:
18 + -15x + 5x2 = -12 + 6x + 2x2

Solving
18 + -15x + 5x2 = -12 + 6x + 2x2

Solving for variable 'x'.

Reorder the terms:
18 + 12 + -15x + -6x + 5x2 + -2x2 = -12 + 6x + 2x2 + 12 + -6x + -2x2

Combine like terms: 18 + 12 = 30
30 + -15x + -6x + 5x2 + -2x2 = -12 + 6x + 2x2 + 12 + -6x + -2x2

Combine like terms: -15x + -6x = -21x
30 + -21x + 5x2 + -2x2 = -12 + 6x + 2x2 + 12 + -6x + -2x2

Combine like terms: 5x2 + -2x2 = 3x2
30 + -21x + 3x2 = -12 + 6x + 2x2 + 12 + -6x + -2x2

Reorder the terms:
30 + -21x + 3x2 = -12 + 12 + 6x + -6x + 2x2 + -2x2

Combine like terms: -12 + 12 = 0
30 + -21x + 3x2 = 0 + 6x + -6x + 2x2 + -2x2
30 + -21x + 3x2 = 6x + -6x + 2x2 + -2x2

Combine like terms: 6x + -6x = 0
30 + -21x + 3x2 = 0 + 2x2 + -2x2
30 + -21x + 3x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
30 + -21x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(10 + -7x + x2) = 0

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

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

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

Solution

x = {2, 5}

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