Step-by-step explanation:
(2x-y+3)(2x-y-3)=
4x²-2xy-6x-2xy+y²+3y+6x-3y-9=
4x²-4xy+y²-9=
(2x-y)²-9
Ummm i don't know what the pmf would be but the probability of grabbing a blue sock would be 10 out of 100...
Simple, solve straight across, its either 4n or 2n
