Question

(х+4)(у-5)=
(х-8)(6-у)=

Answer 1

$(x + 4)(y - 5) = xy - 5x + 4y - 20 \\ (x - 8)(6 - y) = 6x - xy - 48 + 8y$

Answer 2

(х+4)(у-5)=ху-5х+4у-20
(х-8)(6-у)=6х-ху-48+8у