Cho hai đa thức sau: A = –3x^3 + 4x^2 – 5x + 6; B = 3x^3 – 6x^2 + 5x – 4. b) Tính D = A – B.
Giải thích
Lời giải
b) D = A – B = (–3x3 + 4x2 – 5x + 6) – (3x3 – 6x2 + 5x – 4)
= –3x3 + 4x2 – 5x + 6 – 3x3 + 6x2 – 5x + 4
= –6x3 + 10x2 – 10x + 10.
Lời giải
b) D = A – B = (–3x3 + 4x2 – 5x + 6) – (3x3 – 6x2 + 5x – 4)
= –3x3 + 4x2 – 5x + 6 – 3x3 + 6x2 – 5x + 4
= –6x3 + 10x2 – 10x + 10.