Qualification > Math

p1 cie question

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cooldude:
why is root x always postive, for example why do we consider root 4=2 and not +/-2.

astarmathsandphysics:
There are 2 roots. Why do you ask this

cooldude:

--- Quote from: astarmathsandphysics on March 18, 2010, 03:31:54 pm ---There are 2 roots. Why do you ask this

--- End quote ---

because our book says this, for example when x^0.5-6-x
we get x=4,9
they say root x=3,2
and since 6-9=-3 they say that 9 does not satisfy the original equation as they are not considering root x=-3, as they say that root x=>0, so i am asking why is root x=>0?

astarmathsandphysics:
Only because the question says or because x is b length for example:)

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