Question

if a=2+√3, then the value of a-1/a is
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Answer 1

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Answer 2

a=2+√3

1/a=

$1 \times 2 - \sqrt{3}$

$2 + \sqrt{3} \times 2 - \sqrt{3}$

$2 - \sqrt{3}$

$2 ^{2} - \sqrt{3} {}^{2}$

4-√3

1/a= 1

a- 1/a = 2+√3 +1

a-1/a=3+√3