Роздiл 3. Одночлени i многочлени » 578 (4-5)

4) d(4d3 – 2d2 – 1) = –d; 4d4 – 2d3 – d + d = 0; 2d3(2d – 1) = 0; 2d3 = 0; d = 0; 2d – 1 = 0; 2d = 1; d = 0,5. 5) 2z(z – 3) + 14z = 19z; 2z2 – 6z + 14z – 19z = 0; 2z2 – 11z = 0; z(2z – 11) = 0; z = 0; 2z – 11 = 0; 2z = 11; z = 5,5.