Finite Math Examples

$x^{2} + 9 x + 20$

Factor $x^{2} + 9 x + 20$ using the AC method.

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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 $20$ and whose sum is $9$ .

$4, 5$

Write the factored form using these integers.

$(x + 4) (x + 5)$

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