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Question

If x=213−2−13, then 2x3+6x is equal to

A
1
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B
2
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C
3
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D
None of these
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Solution

The correct option is D None of these

We are given,

x=213+213

2x36x=2213+21336x

=2⎢ ⎢2133+2133+32132213+32132132⎥ ⎥6x

=22+21+322313+3213236x

=22+12+3213+2136x

=4+1+6213+2136x

=5+6x6x

=5

Hence, this is the answer.
Option (D) is correct.

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