B. Direction: Evaluate the following expressions.
5. Evaluate (–4a2) for a = –3.
6. Evaluate 6 x2y for x = 5 and y = 2.
7. Evaluate xy – z if x = –3, y = 4, and z = 5
8. Evaluate a(4 – b) if a = 2 and b=1/2 . May sumagot po ng ayos follow ko po​