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Re: Is x negative? (1) x^2 is positive. (2) x^3 is non-positive. [#permalink]
iMyself wrote:
Is x negative?
1) x^2 is positive
2) x^3 is no-positive.


from statement 1: x is +ve or -ve
so, not sufficient

from statement 2: x is zero or negative
so, not suddicient

combine 1 and 2: x=+ve/-ve/zero
spometimes it is positive (No), sometimes it is negative (yes), sometimes it is zero (NO)
which indicates E. but how it is C? experts please. thanks...
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Re: Is x negative? (1) x^2 is positive. (2) x^3 is non-positive. [#permalink]
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iMyself wrote:
iMyself wrote:
Is x negative?
1) x^2 is positive
2) x^3 is no-positive.


from statement 1: x is +ve or -ve
so, not sufficient

from statement 2: x is zero or negative
so, not suddicient

combine 1 and 2: x=+ve/-ve/zero
spometimes it is positive (No), sometimes it is negative (yes), sometimes it is zero (NO)
which indicates E. but how it is C? experts please. thanks...


Hi,
statement I tells you that x is +ive or -ive..
statement II tells you that x is 0 or -ive..
combined..
Look at the two possiblities of x..
ONLY x as -ive is common to two statements, so x is -ive
Suff
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Re: Is x negative? (1) x^2 is positive. (2) x^3 is non-positive. [#permalink]
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Re: Is x negative? (1) x^2 is positive. (2) x^3 is non-positive. [#permalink]
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