(7x+12y)(12y-7x) plezzz pomogite

Question

(7x+12y)(12y-7x) plezzz pomogite

Comments

щас

Answer 1

=144y^2-49x^2

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Comments

(7х+12у)(12у-7х)=84ху-49х^2+144у^2-84ху=-49х^2+144у^2

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84ху зачеркнёшь