WILL CHOOSE BRAINLIEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer:
f(x + 3) = x² + 6x + 5
Step-by-step explanation:
f(x) = x² - 4
f(x + 3) = (x + 3)² - 4
f(x + 3) = x² + 6x + 9 - 4
f(x + 3) = x² + 6x + 5