Question

p³ + q³+ r ³ + 3 pqr​

Answer 1

Answer:

p³+q³+r³-3pqr

=(p+q+r)(p²+q²+r²-(pq+qr+rp)

=(p+q+r){(p+q+r)²-3(pq+qr+rp)}

Answer 2

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${p}^{3} + {q}^{3} + {r}^{3} - 3pqr \\ = (p + q + r)( {p}^{2} + {q}^{2} + {r}^{2} - pq - pr - qr)$