Question

if a=2+√3 find the value of a-1/a​

Answer 1

Answer:

 a²=(2+√3)²=4+4√3+3 =7+4√3 1/a²=(1/a)²=(2-√3)²=4-4√3+3=7-4 √3 ∴, a²+1/a²=7+4√3+7-4√3=14. 4.1.

Answer 2

Answer:

a=2+√3

1/a=1/2+√3

1/a=2-√3

a-1/a=2+√3-2+√3

=2√3

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