Hi

Please have a look on the attachment. Could you please tell me why the calculator is giving the answer (arrow points to the answer under discussion) in absolute form? (x^2 - a^2)^2 would always be a +ve number by definition, so in my opinion there was no need to use absolute form. Please help me. Thanks.

Regards
PG

 

Conventional math requires that the value under a square root and its result are positive numbers.

For example:
\(\sqrt{(-5)^2}=|-5|=5\)

and in general:
\(\sqrt{x^2}=|x|\)

 

Could it be that what is seen as || should actually be ( ) ?? (Look at the formula above the red-arrow one.

--Rich