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Question

If x = 2+223+213, then x36x2+6x =


A

3

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B

2

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C

1

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D

0

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Solution

The correct option is B

2


x = 2+223+213x2 = 223+213

Cubing both sides, we get

x386x2+12x = 6+6(x2)

x36x2+6x = 2


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