Whats the easiest way to solve?
(1001^2 - 999^2)/(101^2 - 99^2)
Answers:
10
20
40
80
100
[spoiler]A/10[/spoiler]
(1001^2 - 999^2)/(101^2 - 99^2)
Answers:
10
20
40
80
100
[spoiler]A/10[/spoiler]
(1001^2 - 999^2)/(101^2 - 99^2)
(a^2 - b^2) = (a+b) (a-b)
Nr = (1001^2 - 999^2) = (1001+999)(1001-999) = 2000 *2
Dr = (101^2 - 99^2) = (200*2)
Nr/Dr = 10
