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which of the following ...

by factor26 » Mon Feb 13, 2012 5:53 pm
which of the following must be equal to zero for all real numbers x?

I. -1/X

II. X+(-X)

III. X ^0

a - I only

b - II only

c - I and III only

d - II and III only

e - I, II, and III

OG answer is b - can someone please explain what they mean by all real numbers X?
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by pemdas » Mon Feb 13, 2012 6:22 pm
this implies all numbers you have studied so far, unless you were math major in college. From the content of your question I read you aren't math major and unaware of complex number operations, therefore consider this as all numbers you know - fractions, decimals, different sign numbers, absolutely all numbers (except for complex numbers).
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by rijul007 » Tue Feb 14, 2012 9:37 am
factor26 wrote:which of the following must be equal to zero for all real numbers x?

I. -1/X

II. X+(-X)

III. X ^0

a - I only

b - II only

c - I and III only

d - II and III only

e - I, II, and III

OG answer is b - can someone please explain what they mean by all real numbers X?
By all real number, they mean all the numbers that can be represented on the number line.
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