Question

What is the coefficient of f(x,y) when you expand (x+y-1)^2???? Who will answer properly will be marked as brainiest?

Answer 1

Answer:

8

Step-by-step explanation:

f=1

so 1(x+y)

=1+1

expand(x+y-1)², let 1=z

=(x²+y²-z²)+2(xy+yz+zx)

=1+1-1+2(1+1+1)

=2+2+2+2

=8

z=1

so,(x+y-1)=8