f(x) = 5x - 3, (x ∈ ℜ), হলে f-1(3) এর মান কত?
Solution
Correct Answer: Option C
y = 5x - 3
⇒ x = y + 3/5
∴ f-1(x) = x +3/5
∴ f-1(3) = 3 + 3/5
= 6/5
⇒ x = y + 3/5
∴ f-1(x) = x +3/5
∴ f-1(3) = 3 + 3/5
= 6/5
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