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One possible solution

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Source: — Data Sufficiency |
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by neoreaves » Sun Mar 28, 2010 2:07 pm
I AGREE ,....answer should be D ...what is the source of the question though ?
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by bhumika.k.shah » Sun Mar 28, 2010 7:54 pm
OA D

Source MGMAT CAT

I meant to say how is each statement sufficient? My pick was E :(
neoreaves wrote:I AGREE ,....answer should be D ...what is the source of the question though ?
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by neoreaves » Sun Mar 28, 2010 8:03 pm
we are only asked to find one possible solution ....from the equation there are two

x = -a or x = b

if we can find either one of them then we are done

1) gives us value of a ...so gives us one possible solution so its sufficient

2) similarly gives us one possible solution so sufficient
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by bhumika.k.shah » Sun Mar 28, 2010 8:06 pm
if a's value is given in statement 1 , we can solve for the first part of the quadratic i.e. (x + a)

But what about the second half ? i.e., (x-b) ?

isn't (x+a)(x-B) a complete quadratic eqn whose answer would depend on a AND b?

neoreaves wrote:we are only asked to find one possible solution ....from the equation there are two

x = -a or x = b

if we can find either one of them then we are done

1) gives us value of a ...so gives us one possible solution so its sufficient

2) similarly gives us one possible solution so sufficient
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by pops » Sun Mar 28, 2010 10:03 pm
a quadratic has 2 solutions.. we are asked to find any 1 solution.. so if we know a or b we get one solution.. hence both statements individually answers..
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