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If the point (1,-4) lies on the graph of f(x), then what would be a point on f^-1(x) ^-1 means the the power of -1

 Oct 16, 2017
 #1
avatar+98128 
+2

f(1)  = -4

f-1(-4)  =  1

 

So

[f-1 (-4)]-1  =    [1]-1     =   1   so the point is    (-4, 1 ) 

 

 

cool cool cool

 Oct 16, 2017
 #2
avatar+64 
+1

excuse me, so the new point is (-4,1), but how did you get the -4...... since you only get that 1  so confused

mrlevan3  Oct 16, 2017
 #3
avatar+98128 
+1

If  (1, -4) is on f(x)......then  ( -4, 1)  is on f-1 (x)

 

So.....

 

f-1 (-4)  = 1

 

So

 

[ f-1(-4)]-1  =   [ 1 ]-1  =   1

 

So   ( -4,1)   is also on  [ f-1(x)]-1

 

 

 

cool cool cool

 Oct 16, 2017
 #4
avatar+64 
+1

thank you, you save me a big time. Bless you

mrlevan3  Oct 16, 2017

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