A(x) = 2x^4 – 5x ³ + 7x – 5 + 4x ³ + 3x ² + 2x + 3 B(x) = 5x^4 – 3x ³ + 5x – 3x^4 – 2x³ + 9 – 6x C(x) = x^4 + 4x ² + 5 a) Tính B(x) – C(x)
A(x) = 2x^4 – 5x ³ + 7x – 5 + 4x ³ + 3x ² + 2x + 3 B(x) = 5x^4 – 3x ³ + 5x – 3x^4 – 2x³ + 9 – 6x C(x) = x^4 + 4x ² + 5 a) Tính B(x) – C(x)