If f(x) = 4(3x - 5), find f^-1(x)
a. f-1(x) = x+20/12
b. f-1(x) = x+5/4
c. f-1(x) = x+5/12
d. f-1(x) = x-20/12

The answer is A.

Step-by-step explanation:

Lets call f(x)=y, so y= 4*(3*x-5), we want to find 'x', using 'y' as a the variable.

Now lets change the name of 'y' to 'x', and 'x' to f^-1(x).

f-1(x) = (x+20)/12

I searched it so I hope this helps.

Step-by-step explanation:

Before sixty years age of Anusha = (X-60) year's. X = 150 year's. Therefore, Age of Arun = 4X = 4 × 150 = 600 years.