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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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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
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!
Re: If x * = x^2 + 4, which of the following is equivalent to   [#permalink] 27 Sep 2017, 08:40
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