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10 January, 10:36

Which is a factor of 5xy - 40x - 15y + 120?

A. 2

B. y - 8

C. x - 4

D. x + 6

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Answers (1)
  1. 10 January, 11:49
    0
    Upon slight rearranging:

    5xy-15y-40x+120, now factor 1st and 2nd pair of terms

    5y (x-3) - 40 (x-3) which is equal to:

    (5y-40) (x-3) if we factor the first parenthetical term as well

    5 (y-8) (x-3)

    So (y-8) is a factor
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