Question

find the value of (pq-qr+pr)(pq+qr)-(pr+pq)(p+q-r)​

Answer 1

Hey mate ,

Here is your answer :

(pq -qr +pr)(pq+qr)-(pr+pq)(p+q-r)

=p²q²+pq²r-pq²r -q²r²+p²qr +pqr² —p²r-pqr+pr² -p²q- pq²+pqr

=(pq)²-(qr)²+ p²qr+ pqr²- p²r- pr²-p²q- pq²

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