Answer:
A
Step-by-step explanation:
f(x) + g(x)
= x² - 2x + 3 + x³ - x² + 4x ← collect like terms
= x³ + (x² - x²) + (- 2x + 4x) + 3
= x³ + 0 + 2x + 3
= x³ + 2x + 3 → A
