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# For the equation shown above, what is the value of x ?

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Founder
Joined: 18 Apr 2015
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For the equation shown above, what is the value of x ? [#permalink]  12 Sep 2020, 07:58
Expert's post
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Question Stats:

100% (01:05) correct 0% (00:00) wrong based on 12 sessions
$$(\sqrt[3]{64}+\sqrt[3]{x})^2=36$$

For the equation shown above, what is the value of x ?

A. 6

B. 7

C. 8

D. 12

E. 14
[Reveal] Spoiler: OA

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Eddie Van Halen - Beat it R.I.P.

Founder
Joined: 18 Apr 2015
Posts: 13640
Followers: 303

Kudos [?]: 3511 [0], given: 12566

Re: For the equation shown above, what is the value of x ? [#permalink]  28 Sep 2020, 21:28
Expert's post
probably the best way is NOT to deal with the radical but to picking numbers.

We do have cube roots and among the answer choices only 8 is a perfect cube root. This is an hint

Using 8 we do have $$(4+2)^2=36$$ Which holds true.

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Eddie Van Halen - Beat it R.I.P.

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Joined: 08 Aug 2020
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Kudos [?]: 68 [1] , given: 7

Re: For the equation shown above, what is the value of x ? [#permalink]  30 Sep 2020, 04:26
1
KUDOS
You dont need to perform any needless computation here
It's only 8 that has an integer cube square root and since the question is in integer form just pick and validate your answer by plugging it back to the question

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Re: For the equation shown above, what is the value of x ?   [#permalink] 30 Sep 2020, 04:26
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