Question: returned the following factor

Hello:
I need your help
How to make maple returned the following results:

R1^2/r0^2-2*R1/r0+1  factor  to (-R1/r0+1)^2

R1^2/r0^2-2*R1/r0+1  factor to (-R1/r0+1)^2

Gracias

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