The product of Zx (x-4) is:
Zx2 - 4Zx
Explanation and Solution:
Multiply Zx to each term of the expression inside the parenthesis
Zx multiplied by x is equal to Zx2
Zx multiplied by -4 is equal to -4Zx,
Combining all the product, we have Zx2 - 4Zx as the answer.
PS. The x2 there is X squared