3U Maths Question Thread

[anotherworld2b]

Could I leave the last line as the answer? In the book the answer is 3In1.5

You haven't used any log rules in that photo (unless it just got chopped off), but everything I see is most certainly correct.

[RuiAce]

Yeah it's fine. Their answer is just nicer.

[anotherworld2b]

I was wondering how did they get their answer?

Yeah it's fine. Their answer is just nicer.

[RuiAce]

I was wondering how did they get their answer?

[winstondarmawan]

Would appreciate help with Q6b). TIA
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20158206_1349616411819114_535623841_n.jpg?oh=11967ad72cf1f8bb705d2f48a91b98c0&oe=596CD4E5
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20117539_1349616508485771_1849124987_n.jpg?oh=e0d3069257fa5869b3907be7f30c43db&oe=596CBECB

[RuiAce]

Would appreciate help with Q6b). TIA
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20158206_1349616411819114_535623841_n.jpg?oh=11967ad72cf1f8bb705d2f48a91b98c0&oe=596CD4E5
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20117539_1349616508485771_1849124987_n.jpg?oh=e0d3069257fa5869b3907be7f30c43db&oe=596CBECB

Previously addressed here and the solutions will be added to the compilation thread.

The other parts are more straightfoward. Were there any that you needed help with?

[anotherworld2b]

I tried to do this question but I am not sure what I did wrong

[caitlinlddouglas]

hi i was wondering how to do ii) and iii) on this question. I'm stuck on ii) and am confused about the terms add to be the coefficient of x^(k+1) in (1=x)^n.
Thanks heaps!
This is the question
http://i.imgur.com/vOXsF0c.png

[Shadowxo]

I tried to do this question but I am not sure what I did wrong

I can't see any error in your working (except omitting the modulus sign for ln|x+2|, but that wouldn't make any difference) and your answer seems right, what did the answers say?
Also I'm not sure what you did in lines 3-7? I believe for this question you just needed to say dx/dt = 1/(t+2) then x= integral of 1/(t+2)dt and go from there.

[RuiAce]

hi i was wondering how to do ii) and iii) on this question. I'm stuck on ii) and am confused about the terms add to be the coefficient of x^(k+1) in (1=x)^n.
Thanks heaps!
This is the question
http://i.imgur.com/vOXsF0c.png

tagged: 2004






Also, part iii should not be done by the binomial theorem, but just by brute force algebra.

[anotherworld2b]

the answer is x = In (t +2) /2 apparently?
I'm not quite sure how they got that answer

I can't see any error in your working (except omitting the modulus sign for ln|x+2|, but that wouldn't make any difference) and your answer seems right, what did the answers say?
Also I'm not sure what you did in lines 3-7? I believe for this question you just needed to say dx/dt = 1/(t+2) then x= integral of 1/(t+2)dt and go from there.

[kiwiberry]

the answer is x = In (t +2) /2 apparently?
I'm not quite sure how they got that answer

They've used this log law again, your answer is the same as theirs

[anotherworld2b]

Ah I see
Would it be incorrect to the leave the answer as it is? Or is a fraction form simply preferred?

They've used this log law again, your answer is the same as theirs

[kiwiberry]

Ah I see
Would it be incorrect to the leave the answer as it is? Or is a fraction form simply preferred?

You may be marked correct if you left it as is, but to be safe you should always simplify your answer as far as possible

[winstondarmawan]

Previously addressed here and the solutions will be added to the compilation thread.

The other parts are more straightfoward. Were there any that you needed help with?

I could do (i). Thank you!

Anyways, I need help with the Q below. TIA
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20134615_1272831189509068_1563889495_n.png?oh=a3006750c9fdc562896e9b13f276e862&oe=596D675F