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  1. If a + 2√3, find the value of
    a3
    .
    a6 + 3a3 + 1
    1. 55
    2. 1
      55
    3. 1
      40
    4. 3
      55
Correct Option: B

a = 2 + √3

1
=
1
a2 + √3

=
2 - √3
=
2 - √3
(2 + √3)(2 - √3)4 - 3

= 2 - √3
Now,
=
=
1
a6 + 3a³ + 13a³ + 3 + 1/a³

[Dividing numerator and denominator by a³]
=
1
a³ +
1
+ 3

=
1
a +
1
³ - 3a +
1
+ 3
aa

=
1
(4)³ - 3(4) + 3

=
1
=
1
(4)³ - 3(4) + 355



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