Find the answer:

Square root (-8)^2 +(-6)^2

=.......

A)I-10I (Absolute value)

B) + or - 10

Well The answer book says A.. but i always knew that square root of a number = -+ of it not only +..

why here ?

This is always confusing....UNLESS we are solving an equation...by convention.....we always take the positive root

So

√ [ (-8)^2 + (-6)^2 ] = √100 = 10

And

l -10 l = 10

So.....

"A" is correct