Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10th
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Find k, if f(k) = 2k – 1 and fof(k) = 5 - Mathematics

Sum

Find k, if f(k) = 2k – 1 and fof(k) = 5

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Solution

f(k) = 2k – 1

fof(k) = 5

f(f(k))m = f(2k – 1) = 5

⇒ 2(2k – 1) – 1 = 5

4k – 2 – 1 = 5

⇒ 4k = 8

k = 2

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APPEARS IN

Samacheer Kalvi Mathematics Class 10 SSLC Tamil Nadu State Board
Chapter 1 Relations and Functions
Exercise 1.5 | Q 4. (ii) | Page 31
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