Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 2 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Need answer and workings
Date Posted: 4 years ago
Views: 207
We factorise x2 - y2 into (x + y) (x - y).
x2 - y2 = 28
(x + y) (x - y) = 28
Since x + y = 4,
4 * (x - y) = 28
x - y = 7
In such questions, we do not actually need to find the individual values of x and y to obtain our answer.
x2 - y2 = 28
(x + y) (x - y) = 28
Since x + y = 4,
4 * (x - y) = 28
x - y = 7
In such questions, we do not actually need to find the individual values of x and y to obtain our answer.
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
hope this is clear!
Date Posted:
4 years ago
360 Tutoring Program