3x^2+36x^2+42x-3x-78=0

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Solution for 3x^2+36x^2+42x-3x-78=0 equation:


Simplifying
3x2 + 36x2 + 42x + -3x + -78 = 0

Reorder the terms:
-78 + 42x + -3x + 3x2 + 36x2 = 0

Combine like terms: 42x + -3x = 39x
-78 + 39x + 3x2 + 36x2 = 0

Combine like terms: 3x2 + 36x2 = 39x2
-78 + 39x + 39x2 = 0

Solving
-78 + 39x + 39x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '39'.
39(-2 + x + x2) = 0

Factor a trinomial.
39((-2 + -1x)(1 + -1x)) = 0

Ignore the factor 39.

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 '(1 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 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 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1

Solution

x = {-2, 1}

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