Question

if a = 2 - √3, then a^2 - 1/a^2

Answer 1

Answer:

a = 2+√3

_____________

1/a = 1/2+√3

By rationalization,

1/x = 2-√3

Now,

a²+1/a²

(2+√3)²+(2-√3)²

4+3+4√3 +4+3-4√3

4+3+4+3

14

I hope this will help you

Answer 2

Answer:

0

Step-by-step explanation:

a=2-√3

a2=(2-√3)^2

a2=4-3

a2=1----------(i)

a^2 - 1/a^2

subsituting value of eqn (i)

(1)^2- 1/1

1-1

=>0

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