Question on method of doing inequalities (1 Viewer)

[trapizi]

I've seen many inequalities questions that start with the standard (a-b)^2 equation.
Is my method acceptable? It's much shorter and still correct in any way. I just don't know if they accept this in the HSC or not.

 

[seventhroot]

Looks fine, what is wrong with it? I personally wrote down the answer at the bottom of the page and worked my way up

 

[Sy123]

I've seen many inequalities questions that start with the standard (a-b)^2 equation.
Is my method acceptable? It's much shorter and still correct in any way. I just don't know if they accept this in the HSC or not.

Anything goes, provided it is mathematically correct and proven (and within reasonable confines of the syllabus)
So yes they will accept that method

 

[trapizi]

Looks fine, what is wrong with it? I personally wrote down the answer at the bottom of the page and worked my way up

I've never seen anyone done this before. Although I know it's correct but there are markers who don't like this method. Also in every HSC sample answers they always start with the equation (a-b)^2.

 

[trapizi]

Anything goes, provided it is mathematically correct and proven (and within reasonable confines of the syllabus)
So yes they will accept that method

Thanks! . This' been worried me.

 

[seventhroot]

I've never seen anyone done this before. Although I know it's correct but there are markers who don't like this method. Also in every HSC sample answers they always start with the equation (a-b)^2.

If they don't like it then too bad for them really. They still have to give you the marks for the reasons sy said

 

[RealiseNothing]

I've never seen anyone done this before. Although I know it's correct but there are markers who don't like this method. Also in every HSC sample answers they always start with the equation (a-b)^2.

wat

I only ever learnt the way you did it. I thought that was the way everyone did it...

 

[Hi there444]

Can you do any question, any way you want though or does it have to be the way the HSC paper marking guidelines have done it?

 

[aDimitri]

Can you do any question, any way you want though or does it have to be the way the HSC paper marking guidelines have done it?

depends whether the question says "Hence"

 

[Carrotsticks]

I've never seen anyone done this before. Although I know it's correct but there are markers who don't like this method. Also in every HSC sample answers they always start with the equation (a-b)^2.

That is perfectly fine.

A marker would be very silly to dislike this method.

Can you do any question, any way you want though or does it have to be the way the HSC paper marking guidelines have done it?

In any way you want, within reason, and as long as it doesn't defeat the purpose of the question.

 

[Hi there444]

depends whether the question says "Hence"

In any way you want, within reason, and as long as it doesn't defeat the purpose of the question.

Oh ok. Thanks

 

[mreditor16]

wat

I only ever learnt the way you did it. I thought that was the way everyone did it...

nah most people are taught (x-y)^2 > 0

and then to sub in root a for x and root b for y