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

Question

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

anonymous · Answer

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

phi · Answer

yes

anonymous · Answer

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

anonymous · Answer

hope that helps