Question

Find A,f of(A)=5,where f(A)=2A-1

Answer 1

Answer:

A=2

Step-by-step explanation:

fof(A) = 5

f(f(A)) = 5

we have f(A) =2A-1

f(2A-1)=5

2(2A-1)-1 =5

4A-2-1=5

4A =5+3

A=8/4

A= 2

Answer 2

Answer:

Hence, A = 3

Step-by-step explanation:

Given f(A) = 5 ...................(1)

and f(A) = 2A -1 ...........(2)

from (1) and (2), we get

2A - 1 = 5

2A = 5+1

2A = 6

⇒ A = $\frac{6}{2}=3$