Algebra Examples

$3 x^{3} - 3 x = 0$

Step 1

Factor $3 x$ out of $3 x^{3} - 3 x$ .

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Step 1.1

Factor $3 x$ out of $3 x^{3}$ .

$3 x (x^{2}) - 3 x = 0$

Step 1.2

Factor $3 x$ out of $- 3 x$ .

$3 x (x^{2}) + 3 x (- 1) = 0$

Step 1.3

Factor $3 x$ out of $3 x (x^{2}) + 3 x (- 1)$ .

$3 x (x^{2} - 1) = 0$

Step 2

Rewrite $1$ as $1^{2}$ .

$3 x (x^{2} - 1^{2}) = 0$

Step 3

Factor.

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Step 3.1

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x$ and $b = 1$ .

$3 x ((x + 1) (x - 1)) = 0$

Step 3.2

Remove unnecessary parentheses.

$3 x (x + 1) (x - 1) = 0$

Step 4

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x = 0$

$x + 1 = 0$

$x - 1 = 0$

Step 5

Set $x$ equal to $0$ .

$x = 0$

Step 6

Set $x + 1$ equal to $0$ and solve for $x$ .

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Step 6.1

Set $x + 1$ equal to $0$ .

$x + 1 = 0$

Step 6.2

Subtract $1$ from both sides of the equation.

$x = - 1$

Step 7

Set $x - 1$ equal to $0$ and solve for $x$ .

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Step 7.1

Set $x - 1$ equal to $0$ .

$x - 1 = 0$

Step 7.2

Add $1$ to both sides of the equation.

$x = 1$

Step 8

The final solution is all the values that make $3 x (x + 1) (x - 1) = 0$ true.

$x = 0, - 1, 1$