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# If x * = x^2 + 4, which of the following is equivalent to

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If x * = x^2 + 4, which of the following is equivalent to [#permalink]  07 Jun 2017, 01:25
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Question Stats:

66% (00:26) correct 33% (00:09) wrong based on 9 sessions

If $$x* = x^2 + 4$$, which of the following is equivalent to $$2*$$ ?

A) (−2)*

B) 0*

C) 4*

D) 6*

E) 8*
[Reveal] Spoiler: OA

_________________
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Re: If x * = x^2 + 4, which of the following is equivalent to [#permalink]  27 Sep 2017, 08:40
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2* = 2^2+2 = 4. Thus, the only number to the * which leads to 4 is -2 since it is elevated to the 2 and it is exactly if we have 2. Answer A!
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Re: If x * = x^2 + 4, which of the following is equivalent to [#permalink]  21 Dec 2017, 09:18
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Hi,

I would like to mention an error that u post above. ie u wrote 2*=2^2+2=4 .it is wrong.but agreeing with ur final answer.
2*=2^2+4=8 and the only number to the * which leads to 8 is -2.thus the answer is option A.
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Re: If x * = x^2 + 4, which of the following is equivalent to [#permalink]  30 Jan 2018, 23:52
2*=2^2+4=8
Option A (-2)*= (-2)^2+4=8
So option A is the answer.
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Re: If x * = x^2 + 4, which of the following is equivalent to [#permalink]  03 Feb 2018, 03:56
Thank you.
Re: If x * = x^2 + 4, which of the following is equivalent to   [#permalink] 03 Feb 2018, 03:56
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