0=15x^3-21x^2+6x

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Solution for 0=15x^3-21x^2+6x equation:


Simplifying
0 = 15x3 + -21x2 + 6x

Reorder the terms:
0 = 6x + -21x2 + 15x3

Solving
0 = 6x + -21x2 + 15x3

Solving for variable 'x'.
Remove the zero:
-6x + 21x2 + -15x3 = 6x + -21x2 + 15x3 + -6x + 21x2 + -15x3

Reorder the terms:
-6x + 21x2 + -15x3 = 6x + -6x + -21x2 + 21x2 + 15x3 + -15x3

Combine like terms: 6x + -6x = 0
-6x + 21x2 + -15x3 = 0 + -21x2 + 21x2 + 15x3 + -15x3
-6x + 21x2 + -15x3 = -21x2 + 21x2 + 15x3 + -15x3

Combine like terms: -21x2 + 21x2 = 0
-6x + 21x2 + -15x3 = 0 + 15x3 + -15x3
-6x + 21x2 + -15x3 = 15x3 + -15x3

Combine like terms: 15x3 + -15x3 = 0
-6x + 21x2 + -15x3 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(-2 + 7x + -5x2) = 0

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

Ignore the factor 3.

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 '(-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

Subproblem 3

Set the factor '(2 + -5x)' equal to zero and attempt to solve: Simplifying 2 + -5x = 0 Solving 2 + -5x = 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 + -5x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -5x = 0 + -2 -5x = 0 + -2 Combine like terms: 0 + -2 = -2 -5x = -2 Divide each side by '-5'. x = 0.4 Simplifying x = 0.4

Solution

x = {0, 1, 0.4}

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