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How many roots does the equation (x^2-1)/(x+1)=x have?

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by Max@Math Revolution » Tue May 21, 2019 11:39 pm

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Answers

A

B

C

D

E

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Difficulty—

[GMAT math practice question]

How many roots does the equation (x^2-1)/(x+1)=x have?

A. 0
B. 1
C. 2
D. 3
E. 4
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by Max@Math Revolution » Fri May 24, 2019 1:07 am
=>

(x^2-1)/(x+1)=x
=> (x+1)(x-1) / (x+1) = x
=> x-1 = x by canceling (x+1).
But x - 1 = x has no solution.

Therefore, the answer is A.
Answer: A
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