একটি ফাংশন f: R-->R, f(x) = 2x+1 দ্বারা সংজ্ঞায়িত হলে f-1(2) এর মান কত?
মনেকরি, y = f(x) = 2x + 1
বা, y = 2x + 1
বা, 2x = y - 1
∴ x = (y - 1)/2
আবার,
y = f(x)
বা, f-1(y) = x
বা, f-1(y) = (y - 1)/2
∴ f-1(x) = (x - 1)/2
তাহলে, f-1(2) = (2- 1)/2 = 1/2
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