x + y = 7, xy = 12 হলে x

x + y = 7, xy = 12 হলে x - y = ?

A 1

B 2

C 3

D 4

Correct Answer: Option A

দেওয়া আছে, x + y = 7
xy = 12

(x - y)² = (x - y)² - 4xy
= 7² - 4.12
= 49 - 48
(x - y)² = 1
∴ x - y = 1