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What is the value of x + 7 ? (1) x + 3 = 14 (2) (x + 2)^2 = [#permalink]
 18 Aug 2010, 01:49
Question Stats:
6% (01:05) correct
93% (00:32) wrong based on 15 sessions
What is the value of │x + 7│? (1) │x + 3│= 14 (2) (x + 2)^2 = 169
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amitjash wrote: What is the value of │x + 7│?
(1) │x + 3│= 14
(2) (x + 2)^2 = 169 I guess you are right it should be C not D, From both the statements we get 2 values but combining 1 and 2 we get x=11. Cheers,
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Answer D is correct.
A. gives us two values of x i.e. x = 11 or x = -11. However when you substitute these values back into equation given in A, x = 11 is the only valid value. Hence we can find mod ( x + 7 ) = 18
Hence A sufficient.
B. also gives us two values of x, i.e. 11 and -11. Resubstitute both values and validate the equation given in B. It holds true only for x = 11. Hence we are able to find mod (x + 7).
Hence B is sufficient as well.
Hence D is correct answer. Thank You.
Thanks,
Akhil M.Parekh
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amp0201 wrote: Answer D is correct.
A. gives us two values of x i.e. x = 11 or x = -11. However when you substitute these values back into equation given in A, x = 11 is the only valid value. Hence we can find mod ( x + 7 ) = 18
Hence A sufficient.
B. also gives us two values of x, i.e. 11 and -11. Resubstitute both values and validate the equation given in B. It holds true only for x = 11. Hence we are able to find mod (x + 7).
Hence B is sufficient as well.
Hence D is correct answer. Thank You.
Thanks,
Akhil M.Parekh B gives 2 values as 11 and -15 (x+2)^2= 13 ^2(x+2)=+-13x=11 , -15 Hence 2 different values Can you explain how did you get values as 11 and -11 in statement B?
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amp0201 wrote: Answer D is correct.
A. gives us two values of x i.e. x = 11 or x = -11. However when you substitute these values back into equation given in A, x = 11 is the only valid value. Hence we can find mod ( x + 7 ) = 18
Hence A sufficient.
B. also gives us two values of x, i.e. 11 and -11. Resubstitute both values and validate the equation given in B. It holds true only for x = 11. Hence we are able to find mod (x + 7).
Hence B is sufficient as well.
Hence D is correct answer. Thank You.
Thanks,
Akhil M.Parekh I think its C. 1) This raises two values, X=11 and -17. Therefore, insufficient. 2) This again raises to two values, X=11 and -15. Therefore, insufficient. Considering 1 and 2, the common value X=11 is considered. Therefore, sufficient.
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Sorry my bad. Yes I calculated it wrong.
For B - it is 11 and -15. Hence insufficient.
Together A and B -> x = 11. Hence C is correct answer.
Thanks for pointing out the mistake.
Akhil M.Parekh
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Answer must be C.
Statement (1) gives two values, x = 11, and x = -17. Both of these values adequately satisfy the equation |x+3|=14. Plug them into |x+7| to get |11+7|=18 and |-17+7|=10. Two different values, thus we can't determine a single solution for x.
Statement (2) also gives two values, x = 11 and x = -15. Both of these values satisfy the equation (x+2)^2=169. Plug them into |x+7| to get |11+7|=18 and |-15+7|=8. Two different values again, thus we can't determine a single solution for x.
Combine (1) and (2) to get x = 11, which results in a single value for |x+7|.
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IMO is C but requesting BL to confirm this.
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answer should be C as for 1) we have two solutions -- 11 & -17 2)we have two answers -- -15,11 but when we combine both of them we have one answer that is to be 11
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Inequality - wrong OA [#permalink]
03 Sep 2010, 23:37
I think D is wrong. What do you think ?
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Re: Inequality - wrong OA [#permalink]
04 Sep 2010, 01:22
nusmavrik wrote: I think D is wrong. What do you think ? Yep, OA is wrong here. See this thread its already discussed. is-oa-wrong-99346.html#p766256
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Re: Inequality - wrong OA [#permalink]
09 Sep 2010, 11:43
I believe C is the answer......
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Re: Inequality - wrong OA [#permalink]
09 Sep 2010, 11:47
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Re: Inequality - wrong OA [#permalink]
09 Sep 2010, 15:54
OA can be correct if question has some more info. Like if x > 0 then D is possible answer
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Re: Inequality - wrong OA
[#permalink]
09 Sep 2010, 15:54
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