Q9(d) (1 Viewer)

[weirdguy99]

Hey,

Did anyone get '9' for (ii)?

 

[someth1ng]

Yes.

 

[asianese]

Most satisfying realisation!

 

[weirdguy99]

Hell yeah!!

 

[bigbirdbanana]

Ok this is gonna sound weird but i got 4 answers for that, one of which was 9, because a square root can be positive or negative. So i had 10 - 1 = 9, 10 - -1 = 11, -10 - 1 = -9, -10 - -1 = -11

I found it weird that they seemed to only ask for one solution, unless there was another parameter to the question that i missed?

 

[weirdguy99]

I think you looked too much into it. Instead of evaluating the square roots, you simply subtract them and they become 0.

 

[bigbirdbanana]

Well it can't equal 0, because whilst all the other roots cancel out, -sqr1 and sqr100 don't, so the answer must come from adding these two. I'm just wondering about the issue of the square roots being able to be positive or negative :S hopefully they understand what I mean by that so I don't lose marks there, because I originally just had 9.

 

[barbernator]

Ok this is gonna sound weird but i got 4 answers for that, one of which was 9, because a square root can be positive or negative. So i had 10 - 1 = 9, 10 - -1 = 11, -10 - 1 = -9, -10 - -1 = -11

I found it weird that they seemed to only ask for one solution, unless there was another parameter to the question that i missed?

Square roots are only positive or negative if stated, or when you evaluate them from taking the square root of a square. if there is a number, e.g. sqrt 100, it is only equal to 10, NOT -10

 

[Neologism]

Okay guys, so I got this question out, showed ALL working, even wrote the line '-1+10' but then underneathe I wrote '11' which I know is COMPLETELY STUPID especially since I do 3U! But seriously, will they still give me the mark or take it away for doing something that stupid ahhhh I was freaking at the end of the exam How much was it worth? 1 or 2?

 

[weirdguy99]

Okay guys, so I got this question out, showed ALL working, even wrote the line '-1+10' but then underneathe I wrote '11' which I know is COMPLETELY STUPID especially since I do 3U! But seriously, will they still give me the mark or take it away for doing something that stupid ahhhh I was freaking at the end of the exam How much was it worth? 1 or 2?

It's a two marker, but I would personally give you 2/2 since well, you got everything right up until the end..

 

[Neologism]

It's a two marker, but I would personally give you 2/2 since well, you got everything right up until the end..

Ooh I really hope so. Fingers crossed!