Question

find k, if f(k) = 2k-1 and fof(k) = 5​

Answer 1

Step-by-step explanation:

fof(k)=5

f(k)=2k-1

f{f(k)}=5

f{2k-1}=5

2(2k-1)-1=5

4k-2-1=5

4k=5+3=8

k=8/4=2 answer-

i hope! i have helped you.

Answer 2

The value of k = 2

Given :

f(k) = 2k - 1 and fof(k) = 5

To find :

The value of k

Solution :

Step 1 of 2 :

Write down the given function

Here the given function is f(k) = 2k - 1

Step 2 of 2 :

Find the value of k

fof(k) = 5

⇒ f(f(k)) = 5

⇒ f(2k - 1) = 5

⇒ 2(2k - 1) - 1 = 5

⇒ 4k - 2 - 1 = 5

⇒ 4k - 3 = 5

⇒ 4k = 5 + 3

⇒ 4k = 8

⇒ k = 2

Hence the required value of k = 2

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