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10 July, 02:39

Prove that the expression (y+8) (y-7) - y (y+1) is negative for any value of y.

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Answers (2)
  1. 10 July, 03:08
    0
    See below.

    Step-by-step explanation:

    (y+8) (y-7) - y (y+1)

    = y^2 + y - 56 - y^2 - y

    = - 56.

    So whatever the value of y the expression will be - 56 which is negative.
  2. 10 July, 03:14
    0
    Y to the 3rd power subtracted by - 57
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