1-(-а+4)(9-а)-(а+3)(а-5)=1-(-9а+а^2+36-4а)-(а^2-5а+3а-15)=-2а^2+15а-20
-2×(-10)^2+15×(-10)-20=-200-150-20=-370
1-(-а+4)(9-а)-(а+3)(а-5)=1-(-9а+а^2+36-4а)-(а^2-5а+3а-15)=-2а^2+15а-20
-2×(-10)^2+15×(-10)-20=-200-150-20=-370