0=3x^2-9x-12

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Solution for 0=3x^2-9x-12 equation:


Simplifying
0 = 3x2 + -9x + -12

Reorder the terms:
0 = -12 + -9x + 3x2

Solving
0 = -12 + -9x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 12 = 12
12 + 9x + -3x2 = -12 + -9x + 3x2 + 12 + 9x + -3x2

Reorder the terms:
12 + 9x + -3x2 = -12 + 12 + -9x + 9x + 3x2 + -3x2

Combine like terms: -12 + 12 = 0
12 + 9x + -3x2 = 0 + -9x + 9x + 3x2 + -3x2
12 + 9x + -3x2 = -9x + 9x + 3x2 + -3x2

Combine like terms: -9x + 9x = 0
12 + 9x + -3x2 = 0 + 3x2 + -3x2
12 + 9x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
12 + 9x + -3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(4 + 3x + -1x2) = 0

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

Ignore the factor 3.

Subproblem 1

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Subproblem 2

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

Solution

x = {4, -1}

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