Question

If f(x)=(x+1)/(x-1) and f(a)=5, then f(2a) is equal to______.

Answer 1

Answer:

f(2a)=3

Step-by-step explanation:

f(x)=(x+1)/(x-1)

f(a)=5

so, 5=(a+1)/(a-1)

5(a-1)=(a+1)

5a-5=a+1

6a=6

a=1

now, f(2a)=(2a+1)/(2a-1)

putting the value of a

=[2(1)+1]/[2(1)-1]

=[2+1]/[2-1]

f(2a)=3

Answer 2

Answer:

20+20=40

40 -30 = 10

10-6=4