Question

(X-1)(y-1) area as product? And area as sum?

Answer 1

Explanation:

product

(x-1)(y-1)

xy-x-y+1

xy-xy+1 (eliminate xy)

=1

sum

x-1 + x-1 + y-1 + y-1

2x-2 + 2y-2

=2x + 2y -4