If f(x) = f'(x) and f(1) = 2, then f(3) =
Answer & explanation
Correct answer: option 2
$\frac{f'(x)}{f(x)}=1 \Rightarrow \log f(x)=x+c$
Since f(1) = 2
∴ log 2 = 1 + c
∴ log f(x) = x + log 2 1
∴ log f(3) = 3 + log 2 1 = 2 + log 2
⇒ f(3) = e2+log2 = e2 . elog2 = 2e2
Hence (2) is the correct answer.