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.

Answer This Question
mint
Mint

secondary 4 chevron_right A Maths chevron_right Singapore

pls help with both ! thank you

Date Posted: 5 years ago
Views: 213
Phylicia Tong
Phylicia Tong
5 years ago
Just spotted your question (u posted the question twice i noticed). To integrate x lnx (dx), u need to use a technique call integration by parts which i am not sure if you are taught. Anyway the answer is (x^2)/2 (lnx - 1/2). Drop me a note if u want e full solution.
Phylicia Tong
Phylicia Tong
5 years ago
Just a thot, observe from the worked solution that differentiating xlnx (dx) gives 1 + lnx..... 1+ ln x can also be written as x^0 + x^0lnx. What if u differentiate x^2 lnx (dx) to see what results u get? Or x^n lnx (dx) to see what u get. I suspect there's a pattern. I am out now so can't work it out. Why don't u explore n try? ;)

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
I highly suspect a question error for Q10 the second part, since you can’t use the differentiation result from the first part to do the second part.