Cambridge 4u Question Help (1 Viewer)

[Shadowdude]

Yeah, so it's the end of the term for me and I decided to revise what I've done so far in 4u...

And then I get stuck about a half hour in.

Exercise 2.1, Question 4, parts d and e.

Conjugates of fractions confuse me completely, considering there is no example in the book for it - and my teacher is nowhere to be seen for the next month or so.

Q4d) conjg[(1/z)] = 1/conjg(z)
Q4e) conjg(z1 / z2) = conjg(z1) / conjg (z2)

Any help is appreciated - and those that help get rep. Seems fitting, I suppose.

 

[jet]

 

[Shadowdude]

So when taking a complex conjugate of a fraction, only the top part is changed, sign-wise?

 

[jet]

So when taking a complex conjugate of a fraction, only the top part is changed, sign-wise?

Well the denominator is a real number, so its conjugate is itself.

 

[bachviete]

So when taking a complex conjugate of a fraction, only the top part is changed, sign-wise?

Instead of thinking of it like that, divide it into real and imaginary, as such



Then its clear by the definition of a conjugate what the result is.

(Sorry jetblack2007 for the intrusion)

 

[jet]

 

[jet]

Instead of thinking of it like that, divide it into real and imaginary, as such



Then its clear by the definition of a conjugate what the result is.

(Sorry jetblack2007 for the intrusion)

You've done nothing to apologise for. Was going to suggest that next.

 

[Trebla]

Alternatively, you could use the properties already proven in c) and d):

 

[jet]

Alternatively, you could use the properties already proven in c) and d):

Yeah, but I'm dumb like that.

 

[Shadowdude]

Wow, so many people to rep... how will I do it?

Maybe with my mouse.

 

[khorne]

OP needs more rep before getting it becomes a reward

 

[Shadowdude]

Well, there's only one way to fix that problem - isn't there? =P

 

[khorne]

What?

 

[untouchablecuz]

What?

(repping shadowdude...)

 

[khorne]

I thought like...negging me or something...

This pretty fail attempt to get rep

 

[Shadowdude]

Well, it's kind of like a circular reference.

You help me, you get rep - you want more rep, you rep me - which helps me.

Then we start over.