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Haha...I had the same question and i had to look it up in a text book. I think k is the unit vector on Oz axis.

Sorry I was talking abt 4u nsb math problem that @Aaryan123 mentioned.

Can you post that problem here? Thanks

Now i realise that y7-10 students should not need to practice past papers

I solved it without using c = sqr(2ab). Where is this question from?

Does anyone where this problem is from? Is it from a math textbook?

I got a similar approach for the first part but for the second i use am-gm: a^2 +b^ >= 2ab

My solution

My solution

I'm curious as well.

agreed.

I never ask anyone to give me expensive resources without giving them something in return. Ask @dumNerd.

I was offended by this word 'mfers' and it's not the first time.

you must be f dumb to believe the owner of delta will give me his resources. Too dumb to solve integration in y9. So dumb that he has to go to multiple tutoring to understand hsc content. I realise that this msg could offend a lot of people so it's only for @Pethmin.

Nah i only need delta resources lol

up to $45/h https://au.indeed.com/cmp/Pre--uni-New-College/jobs?jk=7b0a731531094d32&start=0&clearPrefilter=1

what about my reply to the first post? It's also relevant right?

@iSplicer is, not me.

i'm doing this q from jr year 9 paper while chatting with you :) prove y = sqr(2ab)

I'm a year 9 kid who has read some delta booklets and they were very good.