Question
Question: If f(x + y) = f(x) f(y) ∀ x, y and f(5) = 2, f ′(0) = 3; then f ′(5) is equal to –...
If f(x + y) = f(x) f(y) ∀ x, y and f(5) = 2, f ′(0) = 3; then f ′(5) is equal to –
A
2
B
4
C
6
D
8
Answer
6
Explanation
Solution
f´(5) = f(5) × f´(10) = 2 × 3 = 6