consider the product (x y z)2. if the expression is multiplied out and like terms collected, the result is: x2 y2 z2 2xy 2yz 2xz suppose we do the same to the product (v w x y z)25 (a) what is the coefficient of the term v9w2x5y7z2? (b) how many different terms are there? (two terms are the same if the degree of each variable is the same.)