Hi all ---

For this multiple choice question, I don't know how to compare (a) and (b).

I try ---

Then ---

or if I sub in L ---

Squaring both sides ---

Because --- squaring this for the 1st and then multiplying by 2 for the 2nd --- and .

1st Question ---But how can I compare the last two inequalities? I don't know what specifically L is?

2nd Question ---How does solution get ?

Thanks a lot ---