Question

Please double check for me...
For the function f(x) = (8-2x)2 ,find f-1 . Determine whether f-1 is a function

Answer 1

I think the answer is going to be D??? Just not 100% sure

Answer 2

yes

Answer 3

y = (8-2x)^2 inv x = (8-2y)^2

sqrt(x) = 8-2y
-sqrt(x) = -8+2y
8 -sqrt(x) = 2y

(8 -sqrt(x))/2 = y

becomes
8 (+/-) sqrt(x)
---------------- = y
2


since the graph of sqrt() looks like an elongated "C"
a vertical line will pass thru it at more than one point, therefore, not a function
so D

Answer 4

hope that helps