My stupid math teacher...

[gaelic cowboy]

http://www.xamuel.com/plus-or-minus-square-roots/


Oh just on a side note Prussian Iron in case your confused 6 * (sqrt6) is the same as sqrt(216)

Tellos makes a good point about positive and negative roots myself included we can tend to disregard them.

[Tellos Athenaios]

http://www.xamuel.com/plus-or-minus-square-roots/

There are two solutions to x²=y, cowboy, not two answers to sqrt(x).

[gaelic cowboy]

There are two solutions to x²=y, cowboy, not two answers to sqrt(x).

Indeed at least not yet

now that I have looked at that sum again I'm beginging to think the X^2 is the wrong part and the first part should read instead

6 * (X^3) = 36

cos then

X^3 = 6

which is the same as 3 times cubed root of 8

[Prussian to the Iron]

I would think it was a simple mistake if she hadn't cotinued to argue it. in the 10 minutes spent discussing it, she never once said anything about maybe mistakenly putting the wrong question in, despite my repeated attempts to convince her that it was not possible for both to be true (X^3=6, and 6 X^2=36)

the way cubed root of 8 came out was because she was factoring....36? I think. either way you do it it comes out as that cannot be right.