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10 May, 21:21

Which expression is the factorization of x2 + 10x + 21? (x + 3) (x + 7)

(x + 4) (x+6)

O (X+6) (x + 15)

O (x + 7) (x + 14)

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  1. 11 May, 00:09
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    (x + 3) (x + 7)

    Multiply the two brackets together

    x•x+7•x+3•x+3•7

    x^2+7x+3x+21

    x^2+10x+21

    Answer: (x + 3) (x + 7)
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