simplify -pqr(p2+q2+r2)
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Answer:
(p
2
+q
2
−r
2
)−(2pq)
2
=(p
2
+q
2
−r
2
+2pq)(p
2
+q
2
−r
2
−2pq)
=(p
2
+q
2
+2pq−r
2
)(p
2
+q
2
−2pq−r
2
)
=[(p+q)
2
−r
2
][(p−q)
2
−r
2
]
=(p+q+r)(p+q−r)(p−q+r)(p−q−r)
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