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E
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Difficulty:
5%
(low)
Question Stats:
93% (00:29) correct
7%
(00:46)
wrong
based on 371
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History
Date
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Not Attempted Yet
If \(ab ≠ 0\), then \(a^{-1} + b^{-1}=\)
A. a + b
B. -(a + b)
C. 1/(a + b)
D. 2/(a + b)
E. (a + b)/ab
A. a + b
B. -(a + b)
C. 1/(a + b)
D. 2/(a + b)
E. (a + b)/ab
05 Aug 2019, 13:32
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You might want to recheck your post.
I think you meant to write "a" instead of "2"
Cheers,
Brent
I think you meant to write "a" instead of "2"
Cheers,
Brent
05 Aug 2019, 13:38
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carbazzy
If ab not equal to 0, then \(a^-1 + b^-1\) =
a)a+b
b)-(a+b)
c)\(1/a+b\)
d)\(2/a+b\)
e)\(a+b/ab\)
a)a+b
b)-(a+b)
c)\(1/a+b\)
d)\(2/a+b\)
e)\(a+b/ab\)
Key concept: \(x^{-n}=\frac{1}{x^n}\)
\(a^{-1} + b^{-1} = \frac{1}{a}+\frac{1}{b}\)
\(= \frac{b}{ab}+\frac{a}{ab}\)
\(= \frac{b+a}{ab}\)
Answer: E
Cheers,
Brent
