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.
Hi can please help me. This is NA A Math question. Thank you so much
Date Posted: 3 years ago
Views: 179
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Part (a) u just need to expand to the third term normally the rest just put as +.... because the question said to expand till third term
Part (b), (a+bx)(2-x)^4 the first 3 terms is 16+cx-40x^2. So from this equation, we notice that the highest power of x is 2. Therefore when we expand (a+bx)(2-x)^4 we only want the expansion till x^2 the rest we don’t need it. After expand, we combine we simplify(look at my working). Then we are able to compare coefficient. This part may be quite confusing but let me explain. Example in an equation on the left hand side coefficient of x^2 is 5 naturally on the right side the coefficient of x^2 is also 5. This is a simple example butthe
Part (b), (a+bx)(2-x)^4 the first 3 terms is 16+cx-40x^2. So from this equation, we notice that the highest power of x is 2. Therefore when we expand (a+bx)(2-x)^4 we only want the expansion till x^2 the rest we don’t need it. After expand, we combine we simplify(look at my working). Then we are able to compare coefficient. This part may be quite confusing but let me explain. Example in an equation on the left hand side coefficient of x^2 is 5 naturally on the right side the coefficient of x^2 is also 5. This is a simple example butthe
Date Posted:
3 years ago
The technique is the same for part (b) if you still have questions feel free to ask hope this helps:)
360 Tutoring Program