Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | E Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Solution
Date Posted: 3 years ago
Views: 416
See 1 Answer
(5n + 1)² - (5n - 1)²
= (5n + 1 + (5n - 1))(5n + 1 - (5n - 1))
= (5n + 1 + 5n - 1)(5n + 1 - 5n + 1)
= (10n)(2)
= 20n
(Shown)
The property used is : a² - b² = (a + b)(a - b)
= (5n + 1 + (5n - 1))(5n + 1 - (5n - 1))
= (5n + 1 + 5n - 1)(5n + 1 - 5n + 1)
= (10n)(2)
= 20n
(Shown)
The property used is : a² - b² = (a + b)(a - b)
360 Tutoring Program