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CEO
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What is the value of x? 1. x^4 = |x| 2. x^2 > x [#permalink]
 05 Dec 2007, 04:14
What is the value of x?
1. x^4 = |x|
2. x^2 > x
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Manager
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Re: Exponents and Abs Val [#permalink]
05 Dec 2007, 04:59
bmwhype2 wrote: What is the value of x?
1. x^4 = |x|
2. x^2 > x
I got C:
from st.1 x could be -1, 0, or 1. INSUFF
from st.2 x<0>1. INSUFF
if combined: x=-1
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Senior Manager
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I agree on C, but I don't think x could be 0 on statement in either statement.
0^4 = 1?
0^2 > 0?
Or am I missing something?
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Director
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Re: Exponents and Abs Val [#permalink]
05 Dec 2007, 20:09
elgo wrote: bmwhype2 wrote: What is the value of x?
1. x^4 = |x|
2. x^2 > x I got C: from st.1 x could be -1, 0, or 1. INSUFF from st.2 x<0>1. INSUFF if combined: x=-1 x = -1 doesnt satisfy stmnt 2
i think its E.
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Director
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Re: Exponents and Abs Val [#permalink]
05 Dec 2007, 20:13
ashkrs wrote: elgo wrote: bmwhype2 wrote: What is the value of x?
1. x^4 = |x|
2. x^2 > x I got C: from st.1 x could be -1, 0, or 1. INSUFF from st.2 x<0>1. INSUFF if combined: x=-1 x = -1 doesnt satisfy stmnt 2 i think its E. Sure it does.
if x = -1 then statement 2 would be
(-1)^2 > -1
1 > -1 works fine
but you still need statement 1 to narrow it down to 1 and -1, so the answer is C.
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Current Student
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I get C too..same reason as posted by others
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Manager
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asdert wrote: I agree on C, but I don't think x could be 0 on statement in either statement.
0^4 = 1?
0^2 > 0?
Or am I missing something?
Why 0^4=1?
0*0*0*0=?
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Manager
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It's C
From statement 1, we get x = -1,0,1 (Insufficient)
From statement 2, we get x>1 and x<0 (Insufficient)
Missed x<0 for statement 2, so it should be C
So, combining both we get x = -1
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Manager
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sevenplus wrote: It's E
From statement 2, we get x>1 (Insufficient)
So, combining both not sufficient.
Nope. from st.2 we get x>1 AND x<0
Last edited by elgo on 06 Dec 2007, 13:56, edited 1 time in total.
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CEO
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elgo wrote: asdert wrote: I agree on C, but I don't think x could be 0 on statement in either statement.
0^4 = 1?
0^2 > 0?
Or am I missing something? Why 0^4=1? 0*0*0*0=? zero base raised to any power is zero
any base raised to zero power is 1.
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