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30 January, 22:14

Identify the factors of x2 - 4x - 21.

(x - 7) (x + 3)

(x + 7) (x - 3)

(x + 21) (x - 1)

(x - 21) (x + 1)

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  1. 31 January, 00:52
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    x^2 - (7-3) x-21=0

    =>x^2-7x+3x-21=0

    =>x (x-7) + 3 (x-7) = 0

    => (x+3) (x-7) = 0

    therefore, (x-7) (x+3) is the correct answer.
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