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Question

If x=1+2, then find the value of (x1x)3.
  1. 6
  2. 7
  3. 8
  4. 10

A
6
B
7
C
8
D
10
Solution
Verified by Toppr

Given, x=1+2.

Now,

(x1x)3=(1+2(11+2))3

=[1+2(12+1)×(2121)]3

=[1+2(2121)]3

=[1+2(21)]3

=(1+22+1)3=23=8.

Therefore, option C is correct.

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