Factor by Grouping x^4-3x^2+2

$x^{4} - 3 x^{2} + 2$

Rewrite $x^{4}$ as ${(x^{2})}^{2}$ .

${(x^{2})}^{2} - 3 x^{2} + 2$

Let $u = x^{2}$ . Substitute $u$ for all occurrences of $x^{2}$ .

$u^{2} - 3 u + 2$

Factor $u^{2} - 3 u + 2$ using the AC method.

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $2$ and whose sum is $- 3$ .

$- 2, - 1$

Write the factored form using these integers.

$(u - 2) (u - 1)$

Replace all occurrences of $u$ with $x^{2}$ .

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

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

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

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 $b = 1$ .

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

Remove unnecessary parentheses.

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

Factor by Grouping x^4-3x^2+2

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