Question

if a=2+√3 then find the value of 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

Step-by-step explanation:

Answer 2

Answer:

a=1.7(approximately), therefore 1.7^2-1/1.7^2=13.34( approx)