Answer:
4 and 13
Step-by-step explanation:
(a)
To evaluate f(3) substitute x = 3 into f(x), that is
f(3) = 3 + 1 = 4
(b)
To evaluate gf(3) substitute f(3) = 4 into g(x), that is
g(4) = 4² - 3 = 16 - 3 = 13
