Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
Secondary 1 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Please help
Date Posted: 5 years ago
Views: 289
Let the two digits be A and B.
Given :
A - B = 4, and A² + B² = 58,
now, recall (A - B)² = A² - 2AB + B²
So A² - 2AB + B² = 16
sub in A² + B² = 58,
58 - 2AB = 16
2AB = 42
AB = 21
Only 3 x 7 gives 21. So the two digits are 3 and 7.
The digit can be 73 or 37.
either one will be correct, as
7-3 = 4
7² + 3² = 49 + 9 = 58
Given :
A - B = 4, and A² + B² = 58,
now, recall (A - B)² = A² - 2AB + B²
So A² - 2AB + B² = 16
sub in A² + B² = 58,
58 - 2AB = 16
2AB = 42
AB = 21
Only 3 x 7 gives 21. So the two digits are 3 and 7.
The digit can be 73 or 37.
either one will be correct, as
7-3 = 4
7² + 3² = 49 + 9 = 58
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Hope it’s clear for you :)
Date Posted:
5 years ago
360 Tutoring Program