Factorize it : 49p 2 + 4q 2 + 9r 2 -28pq+12qr-42rp.
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49p 2 + 4q 2 + 9r 2 -28pq+12qr-42rp.
= 49p2 -14pq -21rp -14pq +4q2+6qr -21rp+6qr+9r2
= 7p (7p -2q -3r) - 2q (7p-2q-3r) -3r (7p -2q-3r)
= (7p-2q-3r) (7p-2q-3r)
=(7p-2q-3r)2
= 49p2 -14pq -21rp -14pq +4q2+6qr -21rp+6qr+9r2
= 7p (7p -2q -3r) - 2q (7p-2q-3r) -3r (7p -2q-3r)
= (7p-2q-3r) (7p-2q-3r)
=(7p-2q-3r)2
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