Factor x^2-4x+4

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Algebra

Factor x^2-4x+4

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

Rewrite $4$ as $2^{2}$ .

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

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$4 x = 2 \cdot x \cdot 2$

Rewrite the polynomial.

$x^{2} - 2 \cdot x \cdot 2 + 2^{2}$

Factor using the perfect square trinomial rule $a^{2} - 2 a b + b^{2} = {(a - b)}^{2}$ , where $a = x$ and $b = 2$ .

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

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