Q83 of 128 Page 224

Multiply the following:
(pq- 2r), (pq- 2r)

The multiplication is as follows:

(pq-2r)×(pq-2r)

= (pq.pq-2pq.r-2pq.r + 2r.2r)

= p²q²-4pqr + 2r²

The product is = p²q²-4pqr + 2r²

Multiply the following:

(a² - b²), (a² + b²)

Multiply the following:

(ab + c), (ab + c)

Multiply the following:

, (2p² – 3q²)

Multiply the following:(pq- 2r), (pq- 2r)