# math-calculus

posted by .

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

||3|-|9||

theres too many lines

and these one

-|-sqrt81|

-|cubicrt27

||5|-|-32||

• math-calculus -

• math-calculus -

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.

||3-|9||
= |3-9|
= |-6|
= 6

-|-√81|
= -|-9|
= - 9

etc.

• math-calculus -

thanks jordan and reiny :) but reiny i not understand the whole absolute value thing becuase for -|-sqrt81| you get -9 and that not positive.

• math-calculus -

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 ||

• math-calculus -

okay so everything in || will always be positive? and can u please explain how did u get rid of the two extra lines here ||3-|9||.

• math-calculus -

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:
||5|-|-32||
= | 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 )

• math-calculus -

okay those bracket lines really confusing. how you get |5-32| because that negative sign be separated from f and -32. sorry i just real confused right now

• math-calculus -

i not meant f i mean 5.

• math-calculus -

Did you not read what I said before the
||5|-|-32|| ??

• math-calculus -

okay wait i think i sort of get it now. and absolute value mean how far you are from 0 ?

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