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:

answer: the answer is one

step-by-step explanation:

pemdas, in this situation there is no parenthesis or exponents so you go to multiplication, 1x1=1, then division 1/1= 1 then addition 1+1=2 then subtraction 2-1=1