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The range of the expression 2^(x) + 2^(-...

The range of the expression `2^(x) + 2^(-x) + 3^(x) + 3^(-x)` for `x in R`, is

A

`(-oo, oo)`

B

`[4, oo)`

C

`(6, oo)`

D

`(8, oo)`

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE-RELATIONS AND FUNCTIONS -Assignment (Section - B) Objective Type Questions (one option is correct)
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  4. Let [], and {} denotes the greatest integer function and fractional fu...

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  12. Let R be a relation defined on set A={1, 2, 3,4,5,6,7,8} such that R=...

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  13. Consider two sets A = {a, b}, B = {e, f}. If maximum numbers of relati...

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  14. Consider three sets A = {1, 2, 3}, B = {3, 4, 5, 6}, C = {6, 7, 8, 9}....

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