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

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Mathematics

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22 September, 06:10

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

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Answers (2)

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Rex Holt · Answer 1

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.

Geovanni Mclean · Answer 2

Y to the 3rd power subtracted by - 57