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Am I missing something here. My ans was C. Stat 1 gives two results; x= 11,-17 Stat 2 gives two results; x= 11,-15
Combining these two, we get that x=11 satisfies the statements and answers the question. I have read this reasoning somewhere. Pls suggest whether the logic is correct or not, or what should be the strategy behind these type of questions when one variable satisfies both statements and in turn becomes sufficient to answer the question. Thanks
Re: What is the value of |x + 7|? [#permalink]
18 Aug 2010, 11:43
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).
Re: What is the value of |x + 7|? [#permalink]
18 Aug 2010, 18:14
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
\((x+2)^2= 13 ^2\)
\((x+2)=+-13\)
x=11 , -15
Hence 2 different values
Can you explain how did you get values as 11 and -11 in statement B?
Re: What is the value of |x + 7|? [#permalink]
18 Aug 2010, 20:15
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.
Re: What is the value of |x + 7|? [#permalink]
03 Sep 2010, 09:40
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|.
Re: What is the value of x + 7 ? [#permalink]
01 Jul 2014, 09:06
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