Роздiл 3. Одночлени i многочлени » 473 (5)
5) (3х + 3)(х – 2) = (2х + 1)(х + 6) – 76; 3х2 – 6х + 3х – 6 = 2х2 + 12х + х + 6 – 76; 3х2 – 3х – 2х2 – 12х – х + 70 – 6 = 0; х2 – 16х + 64 = 0; (х – 8)2 = 0; х – 8 = 0; х = 8.
5) (3х + 3)(х – 2) = (2х + 1)(х + 6) – 76; 3х2 – 6х + 3х – 6 = 2х2 + 12х + х + 6 – 76; 3х2 – 3х – 2х2 – 12х – х + 70 – 6 = 0; х2 – 16х + 64 = 0; (х – 8)2 = 0; х – 8 = 0; х = 8.