Question

If a = 2 + √3 ,then find the value of
(I) (a - 1/a) ,
(II) also write the answer after rationalising the denominator so obtained.

(a)2(3+ 2√3) /(2+√3), (II) 2√3

(b)(6+ √3) / (2+√3),(II) √2

(c) (3+ 2√3) /(2+√3),(II) √3

(d)3(3+ 2√3) /(2+√3),(II) -2√3​

Answer 1

Answer:

option d is the correct answer.

Step-by-step explanation:

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Answer 2

Answer:

=2

3

Step-by-step explanation:

Given that,

a=2+

3

Then, Value of

a−

a

1

=2+

3

−

2+

3

1

=2+

3

−

2+

3

1

×

2−

3

2−

3

onrationalize

=2+

3

−

4−3

(2−

3

)

=2+

3

−2+

3

=2

3

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