Phân tích đa thức thành nhân tử: 6a4 + 7a3 –
37a2 – 8a + 12
6a4 + 7a3 – 37a2 – 8a + 12
= (6a4 – 24a2 ) + (7a3 – 14a2) + (a2 – 2a) – (6a – 12)
= 6a2(a2 – 4) + 7a2(a – 2) + a(a – 2) – 6(a – 2)
= (a – 2)(6a3 + 19a2 + a – 6)
= (a – 2)(6a3 + 18a2 + a2 + 3a – 2a – 6)
= (a – 2)(a + 3)(6a2 + a – 2)
= (a – 2)(a + 3)(6a2 – 3a + 4a – 2)
= (a – 2)(a + 3)(2a – 1)(3a + 2)