Stuck in here of Quantum Mechanics Vibrational Motion Maths

Learning Goal: I’m working on a chemistry question and need the explanation and answer to help me learn.

Newbie here, stuck at E7.2a)

From my workings

ψ2(x) = N2(4y 2 − 2)e −y 2 /2

But from the answers

The wavefunction with υ = 2 is ψ2(y) = N2(y 2 − 1)e −y 2 /2

I can only find Ψ(x) from text books, how do I convert it to Ψ(y)

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