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If a^3 + b^2 = 73, then which of the following are the possi

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shadowcatradz
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If a^3 + b^2 = 73, then which of the following are the possi [#permalink] New post   Updated on: 08 Mar 2017, 11:05
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If \(a^3\) + \(b^2\) = \(73\), then which of the following are the possible answer choices?

1. a + b = 7

2. a − b = 2

3. ab = 12

4. 2a − 3b = −1

5. 3a + 5b − 6 = 21

6. \(a^2\) − \(b^2\) = 7

Originally posted by shadowcatradz on 08 Mar 2017, 04:32.
Last edited by Carcass on 08 Mar 2017, 11:05, edited 1 time in total.
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sandy
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Re: exponents question [#permalink] New post   08 Mar 2017, 06:04
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Please share the source of this question. Something seems to be missing here.
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AmanSiso
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Re: If a^3 + b^2 = 73, then which of the following are the possi [#permalink] New post   03 Jul 2017, 04:07
a=4, b=3
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IlCreatore
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Re: If a^3 + b^2 = 73, then which of the following are the possi [#permalink] New post   30 Sep 2017, 05:33
Is there a faster way than trying to substitute numbers to solve this one? I got the answer but it took some time
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sandy
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Re: If a^3 + b^2 = 73, then which of the following are the possi [#permalink] New post   01 Oct 2017, 05:38
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IlCreatore wrote:
Is there a faster way than trying to substitute numbers to solve this one? I got the answer but it took some time


This is not a GRE question. Ideally in this case we have to find numbers which sattisfy this equation and the uderlying assuption seems to be that this is a natural number.

So we take a= 1, 2, 3, ..... and see where we get a natural number for b.

At a=4 we have b=3.

However its not mentioned a and b are natural numbers so this equation can have many soutions.
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gmatclubot
Re: If a^3 + b^2 = 73, then which of the following are the possi [#permalink]
01 Oct 2017, 05:38
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