d) (2p+q) (p-4q) f) (a+3b) (2a-4b)

D
= (2p +q) (p -4q)
= 2p² -8pq +pq -4q²
= 2p² -4q² -7pa

E
= (a +3b) (2a -4b)
= 2a² -4ab + 6ab -12b²
= 2a² -12b² + 2ab

1. (2p+q)(p-4q)
=(2p.p)+(2p.(-4q))+(q.p)+(q.(-4q))
=2p²-8pq+pq-4q²
=2p²-7pq-4q²
2. (a+3b)(2a-4b)
=(a.2a)+(a.(-4b))+(3b.2a)+(3b.(-4b))
=2a²-4ab+6ab-12b²
=2a²+2ab-12b²
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