Объяснение:
(11-n)(n+11)-2(n-3)(2+n)+n^2=
=(11-n)(11+n)+(-2n+6)(2+n)+n^2=
=11^2-n^2+(-4n-2n^2+12+6n)+n^2=
=121-n^2-4n-2n^2+12+6n+n^2=
= - 2n^2+2n+133
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Объяснение:
(11-n)(n+11)-2(n-3)(2+n)+n^2=
=(11-n)(11+n)+(-2n+6)(2+n)+n^2=
=11^2-n^2+(-4n-2n^2+12+6n)+n^2=
=121-n^2-4n-2n^2+12+6n+n^2=
= - 2n^2+2n+133