Question

If Xandy are integers and(x-y)=4, what is the main minimum possibile value of xy? ​

Answer 1

-4

Explanation:

Hello,

x-y=4 <=> x=y+4

so, xy=y(y+4)

`y(y+4)=y^2+4y=(y+2)^2-4`

so this is minimum for y = -2 and the minimum value is -4

thanks