Identify the Zeros and Their Multiplicities y=2x^3-2x

$y = 2 x^{3} - 2 x$

Step 1

Set $2 x^{3} - 2 x$ equal to $0$ .

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

Step 2

Solve for $x$ .

Factor the left side of the equation.

Factor $2 x$ out of $2 x^{3} - 2 x$ .

Factor $2 x$ out of $2 x^{3}$ .

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

Factor $2 x$ out of $- 2 x$ .

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

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

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

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

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

Factor.

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 $b = 1$ .

$2 x ((x + 1) (x - 1)) = 0$

Remove unnecessary parentheses.

$2 x (x + 1) (x - 1) = 0$

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

$x = 0$

$x + 1 = 0$

$x - 1 = 0$

Set $x$ equal to $0$ .

$x = 0$

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

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

$x + 1 = 0$

Subtract $1$ from both sides of the equation.

$x = - 1$

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

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

$x - 1 = 0$

Add $1$ to both sides of the equation.

$x = 1$

The final solution is all the values that make $2 x (x + 1) (x - 1) = 0$ true. The multiplicity of a root is the number of times the root appears.

$x = 0$ (Multiplicity of $1$ )

$x = - 1$ (Multiplicity of $1$ )

$x = 1$ (Multiplicity of $1$ )

$x = 0$ (Multiplicity of $1$ )

$x = - 1$ (Multiplicity of $1$ )

$x = 1$ (Multiplicity of $1$ )

Step 3