a-b=2 ও ab =24 হলে, a^2-b^2 সমান কত?

A 16

B 20

C 26

D 30

Solution

Correct Answer: Option B

আমরা জানি,
 (a+b)=√{(a+b)²+4ab)}
=√{2²+(4×24)}
=√(4+96)
=√100
=10
অতএব, a+b= 10
অতএব,a²-b²=(a+b)(a-b)=10×2= 20

Practice More Questions on Our App!

Download our app for free and access thousands of MCQ questions with detailed solutions