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Do you know how to find an inverse?

Okay thanks..

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ask if you still need help.

-7x=-13-y?? why would there be a y in there??

and then divide the whole thing by -7, but they're going to be fractions.

y= 7x-13
add 13 to both sides,
then divide by 7 [Let there be fractions, its ok]

y = f(x).. They are the same thing

x and y are the same thing??????

f(x) and y are the same thing, so you re-write it as y = 7x-13

got that part?

Yes THANK YOU!!!!

swop d x for d y.... it becomes x = 7y-13

can you do same thing for
f(x)=x^2-16. ?

yep

after swopping, solve for y

7y= x+13
y = (x+13)/7

Yes x=4 + sqrt y

yes, but u have to swop d x and d y back... final answer would be y = 4 + sqrt(x)

did u simplify like this ? \[\sqrt{16+y}=4+\sqrt y \]
no, thats incorrect.

by d do you mean the?

yep

sqrt. y+16=x^2 (Root over y+16)

yeah,
the inverse function will be \[f^{-1}(x)=\sqrt{x+16}\]
no further simplification possible.

ok ? got it ?

Oh got it!!!

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