lilsis76
  • lilsis76
Let f(x)= square root x a) find f inverse x. What is the Domain of f inverse? b) in each case determine whether the given point lies on the graph of f of f inverse (How do I do that?). a) 4,2 b) 2,4 c) 5, sqrt 5 d) sqrt 5, 5 e) a, f(a), where a is greater than or equal to 0 f) f(a), a g) b, f inverse (b) h) f inverse (b), b
Mathematics
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1378440000223:dw|
anonymous
  • anonymous
|dw:1378440055508:dw|
anonymous
  • anonymous
i think every point u have lies in the graph of f inverse

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More answers

lilsis76
  • lilsis76
so to get rid of the square root I have to square it? so my answer is f invers= x squared
anonymous
  • anonymous
with my method u can already know that but if u used the Ti u might ve a hard time
anonymous
  • anonymous
yes @lilsis76
lilsis76
  • lilsis76
oh haha no i understand the way u did it. And the other points, are they a mirror of each other? they look like it
lilsis76
  • lilsis76
@telijahmed is the Domain all real numbers but the negative numbers right?
anonymous
  • anonymous
impressive @lilsis76 i was just coming there ,we need to know the domain of f itself
anonymous
  • anonymous
you know square roots dont take negative numbers
lilsis76
  • lilsis76
YAY!!! i think im get it haha well kind of. haha
anonymous
  • anonymous
|dw:1378440369253:dw|
anonymous
  • anonymous
|dw:1378440404583:dw|
lilsis76
  • lilsis76
okay haha I was trying to figure out how to write it out, I had it backwards.
anonymous
  • anonymous
now the last ones e,f,g,h are a little tricky and i am not sure what to do with them
lilsis76
  • lilsis76
lol okay.
anonymous
  • anonymous
did the Q say f of f inverse or f inverse of x
anonymous
  • anonymous
@lilsis76 that part is very important
anonymous
  • anonymous
|dw:1378440632701:dw|
anonymous
  • anonymous
f of f inverse means take f inverse and put in f of x
lilsis76
  • lilsis76
|dw:1378440723020:dw|
anonymous
  • anonymous
since f inverse is x square then take x square and substitute in the place of x in f of x
anonymous
  • anonymous
|dw:1378440815800:dw|
anonymous
  • anonymous
capiche @lilsis76
lilsis76
  • lilsis76
capiche?
anonymous
  • anonymous
it just means ok
lilsis76
  • lilsis76
YA! I CAPICHE! lol it worked out cuz either way they equalled each other! :D
anonymous
  • anonymous
now that we have f of inverse
anonymous
  • anonymous
we have to check those points
anonymous
  • anonymous
for a \[x=4 ,f(x)=4\]
anonymous
  • anonymous
that means a is not on the graph
lilsis76
  • lilsis76
oh. :/
anonymous
  • anonymous
now for b \[x=2,f(x)=2\]
anonymous
  • anonymous
|dw:1378441142352:dw|
anonymous
  • anonymous
do u see that @lilsis76
lilsis76
  • lilsis76
oh haha I was wondering how you were figuring that out
anonymous
  • anonymous
the points have to be identical to what the function would provide
lilsis76
  • lilsis76
Thank you I see it now :) @telijahmed
anonymous
  • anonymous
just make sure u are keen to the Qs because sometimes as mathematicians we misread things especially if we are familiar ,u saw how i just took the Q to be f inverse be4 looking at how easy it was to verify what i read,You are one smart kid(person,etc) so just ace it @lilsis76
lilsis76
  • lilsis76
haha I will try my best. :) thank you I will close the problem. and open another lol

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