If (x)=2x-1/5x-2, x=2/5
verify whether (f°f) (x) = x
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Answered by
2
fof(x)=x
if
f(x)=
5x−2
2x−1
x
=
5
2
fof(x)=
5(
5x−2
2x−1
)−2
2(
5x−2
2x−1
)−1
fof(x)=
(
5x−2
10x−5−10x+4
)
(
5x−2
4x−2−5x+2
)
fof(x)=
10x−10x−5+4
4x−5x−2+2
fof(x)=
−1
−x
fof(x)=x
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