x + y = 7, xy = 12 হলে x - y = ?
সমাধান
সঠিক উত্তর: 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
xy = 12
(x - y)2 = (x - y)2 - 4xy
= 72 - 4.12
= 49 - 48
(x - y)2 = 1
∴ x - y = 1
