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10 August, 00:10

Which is a factor of 2a (cubed) - 2a (squared) - 7a + 7?

A) (a - 1)

B) (a + 1)

C) (a - 7)

D) (a + 7)

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Answers (1)
  1. 10 August, 00:22
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    2a (cubed) - 2a (squared) - 7a + 7

    = 2a^3 - 2a^2 - 7a + 7

    = 2a^2 (a - 1) - 7 (a - 1)

    = (a - 1) (2a^2 - 7)

    (a - 1) and (2a^2 - 7) are factors

    answer

    A) (a - 1)
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