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21 February, 22:46

Which of the following is a factor of 2xy + 8y - 8x - 32?

5

x + 4

x2 - 4x + 16

All of the above

+4
Answers (1)
  1. 21 February, 23:04
    0
    You could start by eliminating wrong answer (s):

    (a) 5 is definitely not a factor of the given 2xy + 8y - 8x - 32,

    (d) x^2 - 4x + 16 (not x2 - 4x + 16) is not a factor (it has no y terms)

    On the other hand:

    (b) 2 definitely divides evenly into 2xy + 8y - 8x - 32: 2 (xy + 4y - 4x - 16)

    (c) x + 4 divides evenly into both xy + 4y and - (4x + 16):

    We get 2 (x + 4) [y - 4]
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