...x'—9xy+2y'—3xz+2yz—z' take 3zJ — y'— z'+2xy— 3yz +4xy(6) Express algebraically the theorem that the product of the sum and difference of any two quantities is equal to the difference of their squares. (c) Use the theorem of (6) to find the product of 2a+36, 4a2+96', 2a— 36, and 16o4+8164. 3. Factor:...