0=3x^3-11x^2-42x

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Solution for 0=3x^3-11x^2-42x equation:


Simplifying
0 = 3x3 + -11x2 + -42x

Reorder the terms:
0 = -42x + -11x2 + 3x3

Solving
0 = -42x + -11x2 + 3x3

Solving for variable 'x'.
Remove the zero:
42x + 11x2 + -3x3 = -42x + -11x2 + 3x3 + 42x + 11x2 + -3x3

Reorder the terms:
42x + 11x2 + -3x3 = -42x + 42x + -11x2 + 11x2 + 3x3 + -3x3

Combine like terms: -42x + 42x = 0
42x + 11x2 + -3x3 = 0 + -11x2 + 11x2 + 3x3 + -3x3
42x + 11x2 + -3x3 = -11x2 + 11x2 + 3x3 + -3x3

Combine like terms: -11x2 + 11x2 = 0
42x + 11x2 + -3x3 = 0 + 3x3 + -3x3
42x + 11x2 + -3x3 = 3x3 + -3x3

Combine like terms: 3x3 + -3x3 = 0
42x + 11x2 + -3x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(42 + 11x + -3x2) = 0

Factor a trinomial.
x((6 + -1x)(7 + 3x)) = 0

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(6 + -1x)' equal to zero and attempt to solve: Simplifying 6 + -1x = 0 Solving 6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1x = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1x = 0 + -6 -1x = 0 + -6 Combine like terms: 0 + -6 = -6 -1x = -6 Divide each side by '-1'. x = 6 Simplifying x = 6

Subproblem 3

Set the factor '(7 + 3x)' equal to zero and attempt to solve: Simplifying 7 + 3x = 0 Solving 7 + 3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 0 + -7 3x = 0 + -7 Combine like terms: 0 + -7 = -7 3x = -7 Divide each side by '3'. x = -2.333333333 Simplifying x = -2.333333333

Solution

x = {0, 6, -2.333333333}

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