4. Which of the following is always true? Assume that a, b, and n are positive integers.
A. a^n= b^n
B. a^b=b^a
C. a^-b= 1/a^b
D. a^-b= -a^b
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The answer is C.a^-b=1/(a^b). Let a=3,b=2
note: -b is expressed by -1 into b
The question is: 3^-2=1/3^2
Calculating it out we get 1/9=1/9
This is true for a and b set to any positive value
note: -b is expressed by -1 into b
The question is: 3^-2=1/3^2
Calculating it out we get 1/9=1/9
This is true for a and b set to any positive value
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