Упростите выражение (4m-10n)(4m+10n)-(4m-n)² помогите!!!

Question

Упростите выражение (4m-10n)(4m+10n)-(4m-n)² помогите!!!

Comments

16m2-100n2-18m2+8mn+n2=-2-99n2+8mn

Answer 1

(4m-10n)(4m+10n)-(4m-n)²=16m²-100n²-(16m²-8mn+n²)=
=16m²-100n²-16m²+8mn-n²=-101n²+8mn