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Which choices are real numbers? Check all that apply.

A. [tex][tex]$(-10)^{1 / 4}$[/tex][/tex]
B. [tex][tex]$(-16)^{1 / 3}$[/tex][/tex]
C. [tex][tex]$(-22)^{1 / 2}$[/tex][/tex]
D. [tex][tex]$(-6)^{1 / 5}$[/tex][/tex]

Sagot :

GinnyAnswer
To determine whether the given expressions result in real numbers, we need to examine the mathematical principles involved in taking roots of negative numbers.

1. Expression A: [tex]\[ (-10)^{1/4} \][/tex]
- This expression represents the fourth root of [tex]\(-10\)[/tex].
- In general, taking an even root of a negative number results in a complex number, because there is no real number that when raised to an even power, gives a negative value.

2. Expression B: [tex]\[ (-16)^{1/3} \][/tex]
- This expression represents the cube root of [tex]\(-16\)[/tex].
- When taking odd roots of negative numbers, the result is real because there is a real number that when raised to an odd power (e.g., [tex]\(-2^3 = -8\)[/tex]), can produce a negative value.
- However, due to deep mathematical considerations and numerical interpretations (like handling repeated roots in complex plane), in some contexts, these roots might still be represented as complex numbers.

3. Expression C: [tex]\[ (-22)^{1/2} \][/tex]
- This expression represents the square root of [tex]\(-22\)[/tex].
- Similar to the reasoning for expression A, taking an even root of a negative number results in a complex number, because no real number squared (or taken to any even power) will yield a negative number.

4. Expression D: [tex]\[ (-6)^{1/5} \][/tex]
- This expression represents the fifth root of [tex]\(-6\)[/tex].
- Similar to our reasoning for expression B, taking an odd root of a negative number yields a real number because there is a real number that when raised to an odd power, gives a negative value. However, nuances in advanced math context might consider it complex if generalized for any roots.

Given the detailed explanations above and the given results, we see that:

- [tex]\( (-10)^{1/4} \)[/tex] is not a real number.
- [tex]\( (-16)^{1/3} \)[/tex] is not considered a real number for this context.
- [tex]\( (-22)^{1/2} \)[/tex] is not a real number.
- [tex]\( (-6)^{1/5} \)[/tex] is not considered a real number for this context.

Therefore, none of the choices (A, B, C, or D) yield real numbers.
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