p2- 2pq+q2-r2

[p^2-2pq+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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(p2-2pq+q2 )-r2
(​p-q)2-r2
(p-q+r)(p-q-r)
 
  • 3
(p2+q2-2pq)-r2 -(a2+b2-2ab) =(a-b)2 (p+q)2 -r2 (p-q+r) (p-q+r)
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