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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 ?

 Apr 13, 2019
 #1
avatar+102948 
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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

 

 

 

cool cool cool

 Apr 13, 2019

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