=49n²+14n+1-(9n²-66n+121)=
=49n²-9n²+14n+66n+1-121=
=40n²+40n-120
При любых целых n
(40n²+40n-120)/40=
n²+n-3
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=49n²+14n+1-(9n²-66n+121)=
=49n²-9n²+14n+66n+1-121=
=40n²+40n-120
При любых целых n
(40n²+40n-120)/40=
n²+n-3