Question

Multiply the following: 

(pq – 2r), (pq – 2r)

Answer 1

We have,

(pq – 2r) and (pq – 2r)

∴ (pq – 2r)(pq – 2r) = pq(pq – 2r) – 2r(pq – 2r)

= p²q² – 2pqr – 2rpq + 4r²

= p²q² – 4pqr + 4r²