adkikani
EMPOWERgmatRichC Abhishek009 niks18 chetan2u Bunuel VeritasPrepKarishmaWhy do I require to do
any sort of calculations?
I already know that if x is negative, the even powers of
x will be positive. If I subtract a negative number from a
positive number instead of subtracting it from a negative number,
the end result will will have higher difference than subtracting a negative
no from a negative number.
Based on this, A, B and E are out.
For C and D, when I subtract a larger negative no from a negative number
(since now power of x is odd) D will have lower value than C.
Let me know if my above approach is correct?
Hi adkikani,
Most GMAT questions are designed so that they can be solved in more than one way. Since Number Property rules appear repeatedly in the Quant section, you will have the opportunity to approach a number of different questions in the same general way that you approached this one (re: by knowing the rules and properly interpreting what you're told - and what you're asked to solve for - you can answer the question without doing any calculations at all). That having been said, many Test Takers are more likely to make a mistake when dealing with a concept than when dealing with an actual calculation, so you have to be careful about approaching questions on a conceptual level - you might make a little mistake, not realize it and miss out on some easy points.
GMAT assassins aren't born, they're made,
Rich