(5k+n)(k-2n)-k(4k+n)=
(5k+n)(k-2n)-k(4k+n)=5k²-10kn+nk-2n²-4k²-kn=k²-10kn-2n²
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(5k+n)(k-2n)-k(4k+n)=5k²-10kn+nk-2n²-4k²-kn=k²-10kn-2n²