Помогите решить Глава 3 §3 D02 ГДЗ Алгебра 9 класс Шестаков С.А.

а) x²+x+4 = t                                                  б) х²+х+5 = t
t -2√t -8 = 0                                                     t-2√t-15 = 0
(√t -4)(√t +2) = о                                            (√t-5)(√t+3) = о
t = 16                                                               t = 25
x²+x+4 = 16                                                    x²+x+5 = 25
х²+х-12 = 0                                                     x²+x-20 = 0
(x+4)(x-3) = 0                                                 (x+5)(x-4) = 0
Ответ,-4; 3.                                                     Ответ: -5; 4.