Posted by Shreya on .
evaluate
8
okay i know this means square root of 8 squared and that would be 8.
8
this also positive because negative 8squared gives you positive.
i not get these ones
39
theres too many lines
and these one
sqrt81
cubicrt27
532

mathcalculus 
Jordan,
39=5...ANSWER IS 5

mathcalculus 
Reiny,
First of all 8 does not mean "square root" it means
absolute value.
In simple terms it means that you want to take the positive result of the value inside the   signs.
39
= 39
= 6
= 6
√81
= 9
=  9
etc. 
mathcalculus 
Shreya,
thanks jordan and reiny :) but reiny i not understand the whole absolute value thing becuase for sqrt81 you get 9 and that not positive.

mathcalculus 
Reiny,
You have a  sign in front of the whole mess.
suppose it wasn't there, then the answer would be +9
But it is there, so .....
don't confuse a negative inside the  with one outside of the  
mathcalculus 
Shreya,
okay so everything in  will always be positive? and can u please explain how did u get rid of the two extra lines here 39.

mathcalculus 
Reiny,
work it like you had brackets.
start with the innermost and work towards the outside ones, only drop the  signs if you have a single digit left inside.
e.g. the last one:
532
=  5  32 , I worked on the inside ones
=  27
= 27
(perhaps in your notebook you could use different colours for each set,
e.g.
use red for the inside, and blue for the inside ) 
mathcalculus 
Shreya,
okay those bracket lines really confusing. how you get 532 because that negative sign be separated from f and 32. sorry i just real confused right now

mathcalculus 
Shreya,
i not meant f i mean 5.

mathcalculus 
Reiny,
Did you not read what I said before the
532 ?? 
mathcalculus 
Shreya,
okay wait i think i sort of get it now. and absolute value mean how far you are from 0 ?