If $xy\ne 0$ and $x^{y+1}=2x^y-1,$ what is the value of $x?$

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Tue Aug 17, 2021 7:14 am

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If $xy\ne 0$ and $x^{y+1}=2x^y-1,$ what is the value of $x?$

(1) $x^y=x$

(2) $x^2=1$

Answer: D

Source: GMAT Club Tests

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Source: Beat The GMAT — Data Sufficiency | Tue Aug 17, 2021 7:14 am

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