3. Do as directed
(a) Identify the terms and their factors
i. 3a2 - b2 + c2
ii. 5 - x2
iii. x2 - x + 3
iv 2xy2 + x2y
v. - xy + x2 -15
vi. x3 - y3 + z3

B. Represent the following by tree diagram.

i. 3 + y3
ii. 1 - 2a2 - 2b2 - c2
iii. - x3​