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What is the value of x? 1) (-x)^3 = -x^3 2)

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What is the value of x? 1) (-x)^3 = -x^3 2) [#permalink] New post 22 May 2003, 22:48
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What is the value of x?

1) (-x)^3 = -x^3
2) (-x)^2 = -x^2

open to debate.....
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 [#permalink] New post 22 May 2003, 23:33
what does (...) mean? Simple parentheses?
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 [#permalink] New post 22 May 2003, 23:53
stolyar wrote:
Aha... I see a trick. B?



perfect :!: :!: :!:

:cool :musband :wave :drinking :snipersmile: :woohoo
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 [#permalink] New post 23 May 2003, 08:25
plz explain how it is B.........
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 [#permalink] New post 23 May 2003, 17:10
from statement 1,

if x = 0 both sides are equal
if x = 1 both sides are again equal {(-1)^3 = -1 & -1^3 = 1}

therefore x =0 or x = 1

from statement 2

x can only be zero because the square of a number other than zero cannot be negative. {(-1)^2 = 1 which is not equal to -(1)^2)}

therefore statement 2 is sufficient to say that x = 0

hope that helps
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 [#permalink] New post 23 May 2003, 17:14
Expert's post
brstorewala wrote:
from statement 1,

if x = 0 both sides are equal
if x = 1 both sides are again equal {(-1)^3 = -1 & -1^3 = 1}

therefore x =0 or x = 1

from statement 2

x can only be zero because the square of a number other than zero cannot be negative. {(-1)^2 = 1 which is not equal to -(1)^2)}

therefore statement 2 is sufficient to say that x = 0

hope that helps



I agree about -(1)^2, but where did you get it?
we have only -x^2 and (-x)^2; is it the -x^2 ?

-=
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 [#permalink] New post 23 May 2003, 17:28
yes it is -x^2

negative sign is not included in the power.
  [#permalink] 23 May 2003, 17:28
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What is the value of x? 1) (-x)^3 = -x^3 2)

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