My Math Forum plus-minus before a (for example, square-root)

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 March 8th, 2019, 04:08 AM #1 Senior Member   Joined: Nov 2011 Posts: 250 Thanks: 3 plus-minus before a (for example, square-root) "The paper 'bear' everything" Are there examples in abstract math that we cannot put plus-minus sign before a root? For example, when we calculating the solutions of quadratic equation we use the sign. So, when we don't use it in the Realm of Abstract Algebra? Last edited by shaharhada; March 8th, 2019 at 04:14 AM. Reason: grammar correction
 March 8th, 2019, 06:33 AM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,650 Thanks: 2630 Math Focus: Mainly analysis and algebra Any time we don't want to say "plus or minus".
March 8th, 2019, 06:43 AM   #3
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Quote:
 Originally Posted by v8archie Any time we don't want to say "plus or minus".
So every question in Abstract Algebra can always can plus or minus and there are no question that if it is not mentioned exactly what the want?
(2) So, there also not hints in Abstract Algebra Realm, so you can see that you can only use only plus or only minus? (I mentioned it cannot be seem in explicit instruction of the question)?

March 8th, 2019, 08:26 AM   #4
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Quote:
 Originally Posted by shaharhada So every question in Abstract Algebra can always can plus or minus and there are no question that if it is not mentioned exactly what the want? (2) So, there also not hints in Abstract Algebra Realm, so you can see that you can only use only plus or only minus? (I mentioned it cannot be seem in explicit instruction of the question)?
Typically in Abstract Algebra (to my limited knowledge) if we have a quadratic that needs to be solved and the roots used for something then we simply say that the roots are $\displaystyle r_1$ and $\displaystyle r_2$. I've only rarely seen plus or minus notation to be needed.

-Dan

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