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Yeh def I wasnt writting it like that with the ()--> -3(x^n)-- everything is powered.. basic I guess..!
Thanks a lot!
- by lolap4
Tue Mar 15, 2011 6:28 am- Forum: Problem Solving
- Topic: GMAT PRP QUESTION
- Replies: 9
- Views: 1554
well, as far as I know that is a basic Maths rule.. But I think I know where I am going wrong here when I do the problem I write it like this: -3*x^n and then that rule stands (again I think.. clearly not an expert) In this case same as -2^2 =-4 you only power the number not the sign.. but what I sh...
- by lolap4
Tue Mar 15, 2011 4:33 am- Forum: Problem Solving
- Topic: GMAT PRP QUESTION
- Replies: 9
- Views: 1554
Thanks for your reply! but look at it this way: so I get what you are saying but shoudnt you be doing the exponent first ??? By RULE PEMDAS: it should be this order -3(x)^n so we have to do (x)^n first but we have no parentheses. Mathematics state that if the X has no parenthesis the sign is not pow...
- by lolap4
Tue Mar 15, 2011 3:20 am- Forum: Problem Solving
- Topic: GMAT PRP QUESTION
- Replies: 9
- Views: 1554
btw the question isnt more specific that what I posted, but I suppose is how you stated it the second time: -3(x^n).. but still I am confused with the () rule.. am I missing something=?
- by lolap4
Tue Mar 15, 2011 2:51 am- Forum: Problem Solving
- Topic: GMAT PRP QUESTION
- Replies: 9
- Views: 1554
Yes, definitely that's what comes to mind. However I have seen recently this norm:
(-2)^2 = 4
-2^2= -4
This is why I chose A... I saw this rule in a manhattangmat test.. so maybe it does not apply to real GMAT problems ?
- by lolap4
Tue Mar 15, 2011 2:47 am- Forum: Problem Solving
- Topic: GMAT PRP QUESTION
- Replies: 9
- Views: 1554
GMAT PRP QUESTION
If n is an integer is -3x^n positive ?
(1) x is negative
(2) n is odd
My answer was A bcos it doesnt have parentheses so x would keep the negative sign no matter what n was. Thus -3*-x = would al ways yield > 0 RIGHTT???
- by lolap4
Tue Mar 15, 2011 2:38 am- Forum: Problem Solving
- Topic: GMAT PRP QUESTION
- Replies: 9
- Views: 1554