Question

If f(1-3^x) = x then find f(-8)

Answer 1

2

Answer 2

Let y=1-3^x

Answer 3

I know the answer.

Answer 4

Now, express x interms of y

Answer 5

y=1-3^x
3^x=1-y
x ln3 =ln(1-y)
x= ln(1-y) /ln3

Answer 6

So,
f(x)=ln(1-x) /ln3

Answer 7

Now, can u find f(-8)

Answer 8

thanks

Answer 9

WELCOME