Magnitogorskru

Verified answer

(а+4)(-а-4)=-а^2-4а-4а-16=-а^2-8а-16;/// (2b-7)(7-2b)=14b-4b^2-49+14b=28b-4b^2-49//// (-2p^2-3q)(2p^2+3q)= -4р^4-6р^2g-6р^2g-9g= -4р^4-12р^2g-9g