VCE Methods Question Thread!

[Gentoo]

Both cases you just want to get rid of the surd in the denominator. In the case of , all you need to do is multiply the numerator and denominator by the surd because it's just a single-term denominator.

The case of is inherently more complicated because you can't just multiply the numerator and the denominator by one term to get rid of the surd. In this case, you have to make use of the difference of perfect squares rule, where squaring the surd makes turns it into an integer. This wouldn't work if it was, say the cube root of 3. It works because it's the square root, and multiplying it by its conjugate turns the term into an integer while simultaneously allowing the middle terms (that would contain root(3)s) to cancel out.

[lzxnl]

Both cases you just want to get rid of the surd in the denominator. In the case of , all you need to do is multiply the numerator and denominator by the surd because it's just a single-term denominator.

The case of is inherently more complicated because you can't just multiply the numerator and the denominator by one term to get rid of the surd. In this case, you have to make use of the difference of perfect squares rule, where squaring the surd makes turns it into an integer. This wouldn't work if it was, say the cube root of 3. It works because it's the square root, and multiplying it by its conjugate turns the term into an integer while simultaneously allowing the middle terms (that would contain root(3)s) to cancel out.

Your example is horrible. It's just equal to -1

[Gentoo]

Hey, it wasn't my example, it was the one cosine brought up before. :p

But yeah, alternatively you could realise that the numerator and denominator are just negatives of each other so the term is equal to -1 LOL. Tis a poor example for showing how to rationalise denominators by multiplying by conjugates. Imagine it's a root(4) the numerator instead then so you actually have to multiply by the conjugate haha.

[chansena]

Hi!

Just a question relating to the CAS. How do i get all my answers in decimal as a default instead of fraction. I cant remember the setting that needs to be changed in settings ? for the Ti-Nspire  CX


Thanks !!

[knightrider]

Hey guys so i was just looking through the methods graded distributions for 2013.

The thing i don't understand is how do they work out what score you get for graded assessment 1 which is the COURSEWORK  for UNIT 3/4.
How does the score range   become out of 100?

Also for males it says 16% got a pluses and for females 14% got a pluses.
But when it says all it only says 15 % got a pluses. How does this work as shouldn't  this be 16+14=30%.

Also what does the cumul section stand for /mean?

Thanks 

[StupidProdigy]

Hi!

Just a question relating to the CAS. How do i get all my answers in decimal as a default instead of fraction. I cant remember the setting that needs to be changed in settings ? for the Ti-Nspire  CX


Thanks !!

Should be in settings-->document settings-->calculation mode (change it to approximate, it will be on either auto or exact)

[knightrider]

How is this right?(attached)

[kinslayer]

How is this right?(attached)

It's not, looks like a typo. Perhaps they meant .

[knightrider]

It's not, looks like a typo. Perhaps they meant .

Thanks kinslayer 

would you be able to answer my question on graded distributions in my post above?
Thanks

[kinslayer]

Thanks kinslayer 

would you be able to answer my question on graded distributions in my post above?
Thanks

The 100 is just there because the individual percentages all add up to 100%.

If 14% of males got A+ and 16% of females and the cohort is close to 50/50 overall then it makes sense that 0.5*0.14 + 0.5*0.16 = 15% overall. Doesn't look like it's distributed that way, but the difference is probably just rounding.

The cumul section is cumulative, gives you an idea of how many people got that mark or below.

[cosine]

Hey guys so i was just looking through the methods graded distributions for 2013.

The thing i don't understand is how do they work out what score you get for graded assessment 1 which is the COURSEWORK  for UNIT 3/4.
How does the score range   become out of 100?

Also for males it says 16% got a pluses and for females 14% got a pluses.
But when it says all it only says 15 % got a pluses. How does this work as shouldn't  this be 16+14=30%.

Also what does the cumul section stand for /mean?

Thanks 

Hey knightrider, where can I access this document? Thanks

[Floatzel98]

Is this right?

[cosine]

Is this right?

Yes, good job! 

[knightrider]

The 100 is just there because the individual percentages all add up to 100%.

If 14% of males got A+ and 16% of females and the cohort is close to 50/50 overall then it makes sense that 0.5*0.14 + 0.5*0.16 = 15% overall. Doesn't look like it's distributed that way, but the difference is probably just rounding.

The cumul section is cumulative, gives you an idea of how many people got that mark or below.

Thanks kinslayer 

The thing i don't understand is how do they work out what score you get for graded assessment 1 which is the COURSEWORK  for UNIT 3/4.
How does the score range   become out of 100?

[Cosec]

Healpppppp