f(x) = 5x - 3, (x ∈ ℜ), হলে f-1(3) এর মান কত?

A 5/6

B -5/6

C 6/5

D - 6/5

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

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