a + b = √16 এবং ab = 1 হলে, (a-b)2 = কত?

a + b = √16 এবং ab = 1 হলে, (a-b)² = কত?

A 12

B 14

C 18

D 20

Solution

Correct Answer: Option A

দেওয়া আছে,
a + b = √16 = 4

এবং ab = 1
∴ (a-b)² = (a + b) -4ab

= 4 ² - 4.1

= 16-4
= 12