Consider the figure.
find ab if bc = 3, bd = 5, and ad = 5.
ab= ?

In right angled triangle ΔBCD we have:

Using the Pythagorean Theorem we have:

But as a length of a side can't be negative.

Hence, we have:

Also, In right angled triangle ΔBCA using the Pythagorean Theorem we have:

( Since, on taking square root on both the side we have negative or positive term but the length of a side can't be negative.

Hence, we took answer as a positive value)

Hence, we have:

i don't even know man. edge inuity be messing with us. i had to ask a question too.

the answer is d. (1.2, -4.7) on edgn

hope this !