(3а+2)(3а-2)-4а(3-а) (3а+2б)(2б-3а)= (9a2-6a+6a-4)-4a(3-a)(3a+2б)(2б-3a) = 1(9a2-6a+6a-4)+(-36a2-24a+12a3+8a2)(2б-3a) = 1(9a2-6a+6a-4)+(-72a2+108a3-48a+72a2+24a3-36a4+16a2-24a3) = 9a2-6a+6a-4+(-72a2+108a3-48a+72a2+24a3-36a4+16a2-24a3) = 9a2-6a+6a-4-72a2+108a3-48a+72a2+24a3-36a4+16a2-24a3 = – 36a4 + 108a3 + 25a2 – 48a – 4