Giải: a) \( x^2 + 2x + 1 < 9 \) b) \( \frac{x^3 - 4x^2 + 5x - 20}{x^3 - x^2 - 10x - 8} > 0 \)

Giải: a) \( x^2 + 2x + 1 < 9 \)
b) \( \frac{x^3 - 4x^2 + 5x - 20}{x^3 - x^2 - 10x - 8} > 0 \)