Answer:
4,9
Step-by-step explanation:
(1). 4,9 are not prime number
(2) 4=1×2×2
9 = 1×3×3
so,
HCF of 4,9 will be
= 1.
3
x = 6
f(x) = 2x
f(6)
f(6) = 2(6)
f(6) = 12