Question

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

Answer 1

Y to the 3rd power subtracted by -57

Answer 2

See below.

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.