Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | A Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
need help with this qn, pls explain too
Date Posted: 3 years ago
Views: 164
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Hope this helps eh, thanks.
Date Posted:
3 years ago
why x^2 and x no need to be replaced tho
Because we replace the more "complicated terms" like 1st and 2nd derivatives - in order to show that it will lead to "y".
Also, the right-hand side "y", does not contain 1st and 2nd derivatives, hence these 2 were to be replaced, so that you could simplify with terms in "x".
Hope this clarifies. Else I would get back to you tomorrow eh. Thanks.
Also, the right-hand side "y", does not contain 1st and 2nd derivatives, hence these 2 were to be replaced, so that you could simplify with terms in "x".
Hope this clarifies. Else I would get back to you tomorrow eh. Thanks.
ohh, so for these proving questions, we only replace those non-x ones, like derivatives and y such that everything is in x?
The full method of solving without "substitution" is only covered in JC, so at the secondary level we just verify the validity of the statement
The whole idea here is to get to the RHS, which is y.
The idea is to simplify the LHS such that you get y on the RHS.
So we only need to rewrite those dy/dx and d²y/dx² by substituting their equivalent terms in x such that we can simplify everything since it is now in terms of x.
The idea is to simplify the LHS such that you get y on the RHS.
So we only need to rewrite those dy/dx and d²y/dx² by substituting their equivalent terms in x such that we can simplify everything since it is now in terms of x.
At A levels, you will learn something called implicit differentiation (it is based on the chain rule), which avoids the need for these substitutions most of the time.
Alternatively, you could start from the RHS and work your way to LHS.
It will be the reverse of the steps that Mr Ang has shown you.
But this is much harder as you will need to know how to rewrite the terms as terms involving dy/dx and d²y/dx²
It will be the reverse of the steps that Mr Ang has shown you.
But this is much harder as you will need to know how to rewrite the terms as terms involving dy/dx and d²y/dx²
Well, pardon me replying so late, had a busy day today.
Anyway, I believe Mr Eric and Mr J had also explained the more advanced proof would be covered in the A Levels eh.
Have a good evening everyone. :)
Anyway, I believe Mr Eric and Mr J had also explained the more advanced proof would be covered in the A Levels eh.
Have a good evening everyone. :)
ok thx for helping me :)
360 Tutoring Program