x + y = 17 এবং xy = 60 হলে x - y = কত?

x + y = 17 এবং xy = 60 হলে x - y = কত?

A 7

B 8

C 9

D 10

Solution

Correct Answer: Option A

(x-y) ²=(x+y) ² -4xy=(17) ²-4.60 =289-240
x-y = √49=7