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if a= 2 + √3, then find the value of a a - 1/a ?
SoL:-
given that
a= 2+√3
then value of
a - 1/a = 2 + √3 - 1
________
2 + √ 3
= 2 + √3 - 1 2 - √3
________ × _________. on
2 + √ 3 2 - √3 rationalize
= 2 + √3 - ( 2 - √3 )
_________
4 - 3
= 2 + √3 - 2 + √3
= 2√3
hence this is the answer
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