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Mathematics
Mathematics
Problem
Let
s
(
x
)
=
2
x
+
3
5
s(x)=\dfrac{2x+3}{5}
s
(
x
)
=
5
2
x
+
3
. Prove that
s
−
1
(
s
(
s
−
1
(
s
(
y
)
)
)
)
=
y
s^{-1}\!\bigl(s(s^{-1}(s(y)))\bigr)=y
s
−
1
(
s
(
s
−
1
(
s
(
y
)))
)
=
y
for every real number
y
y
y
.
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