3U Maths Question Thread

[anotherworld2b]

I see now
thank you for your help

3(x-3)² is the common factor

3(x-3)²(3x+7) + 3(x-3)³
= 3(x-3)²(3x+7+x-3)
= 3(x-3)²(4x+4)
= 12(x-3)²(x+1)

[bsdfjnlkasn]

This most likely came out of Cambridge. It's just a dummy placeholder; if anything I'd ignore it and wait till radians are taught.

It did come out of Cambridge, but I wasn't sure what the ° represented so thanks for clearing that up. I have learnt radians by the way   

[RuiAce]

It did come out of Cambridge, but I wasn't sure what the ° represented so thanks for clearing that up. I have learnt radians by the way   

Yeah my bad. Got the ordering a bit mixed up.

But yeah that just means degree

[anotherworld2b]

Could i have help with this question please?

[QC]

Could i have help with this question please?

dude this is like simple 2u stuff, for a) just let x=-1 and y=-16 and u get it
for b) find the gradient fn then let x=-1
c) use both as u will find 0=6a-2b and a-b=4 therefore a=-2 and b=-6
Can u at least try a bit more working before posting because you could definitely get part 1 and probably the whole thing.

[jamonwindeyer]

dude this is like simple 2u stuff, for a) just let x=-1 and y=-16 and u get it
for b) find the gradient fn then let x=-1
c) use both as u will find 0=6a-2b and a-b=4 therefore a=-2 and b=-6
Can u at least try a bit more working before posting because you could definitely get part 1 and probably the whole thing.

Mate, I really appreciate your answer, but please think about the comments you are making. People wouldn't ask questions if they didn't genuinely need the help, and not everyone finds this stuff simple (as a side note, anotherworld2b is from WA, and this is the most appropriate place for their questions because the content seems to straddle 2U and 3U)

[QC]

Mate, I really appreciate your answer, but please think about the comments you are making. People wouldn't ask questions if they didn't genuinely need the help, and not everyone finds this stuff simple (as a side note, anotherworld2b is from WA, and this is the most appropriate place for their questions because the content seems to straddle 2U and 3U)

Yeah sorry, its just that he has asked quite a few questions previously and with that knowledge he could definitely solve that question. I'm just trying to say that if he had at least shown a few more lines of working like possibly subbing the point given into the equation, or differentiating a curve, which he has asked about in previous questions, he could have learnt and grown more confident in his ability than if someone just wrote the answer out. I'm not trying to make him feel bad or anything, I'm just trying to tell him how to improve.

[jamonwindeyer]

Yeah sorry, its just that he has asked quite a few questions previously and with that knowledge he could definitely solve that question. I'm just trying to say that if he had at least shown a few more lines of working like possibly subbing the point given into the equation, or differentiating a curve, which he has asked about in previous questions, he could have learnt and grown more confident in his ability than if someone just wrote the answer out. I'm not trying to make him feel bad or anything, I'm just trying to tell him how to improve.

I hear you, so I hope you'll hear me when I say you did not express yourself in the best way, because that is not the way it came across. People ask questions because they need help in approaching it; if you look at a question and don't know how to approach it, that's it. You are stuck. If you don't know that you need to substitute the coordinates, then you won't be able to progress towards the answer. If you don't know that you need to differentiate, or don't think to try it, then you are stuck. The only way you improve from there is being brave enough and having the guts to put your hand up and go, "Yo, not sure what I should do here," so someone can point you in the right direction. That's not an easy thing to do, especially on the internet to a big audience - Never should anyone be made to feel like they shouldn't have asked their question.

Anyway, thanks for your answer and thank you for the discussion. Let's get back onto the Math

[anotherworld2b]

It is my fault. I will be more careful in posting questions in the future.

Yeah sorry, its just that he has asked quite a few questions previously and with that knowledge he could definitely solve that question. I'm just trying to say that if he had at least shown a few more lines of working like possibly subbing the point given into the equation, or differentiating a curve, which he has asked about in previous questions, he could have learnt and grown more confident in his ability than if someone just wrote the answer out. I'm not trying to make him feel bad or anything, I'm just trying to tell him how to improve.

[jamonwindeyer]

It is my fault. I will be more careful in posting questions in the future.

You can post literally any question you like and I or someone else will happily answer it

[Shadowxo]

It is my fault. I will be more careful in posting questions in the future.

Jamon's right, we don't mind! As long as you give it a shot!

[anotherworld2b]

thank you

[bsdfjnlkasn]

Hey, how would you approach solving q11? Thank you!

[RuiAce]

Hey, how would you approach solving q11? Thank you!

(Image removed from quote.)

[bsdfjnlkasn]

Thank you Rui. I understand the first part but was wondering where the 1 from the cos2x formula went when you were solving part b. How are you able to just equate the two parts of the expression with the angle?