a+b=8 ও ab=15 হলে a2-b2 সমান কত?
Solution
Correct Answer: Option C
দেওয়া আছে,
a + b = 8
ab = 15
∴ a - b = √{(a + b)2 - 4ab}
= √(82 - 4 × 15)
= √(64 - 60)
= √4
= 2
∴ a2 - b2
= (a + b)(a - b)
= 8 × 2
= 16
a + b = 8
ab = 15
∴ a - b = √{(a + b)2 - 4ab}
= √(82 - 4 × 15)
= √(64 - 60)
= √4
= 2
∴ a2 - b2
= (a + b)(a - b)
= 8 × 2
= 16
Practice More Questions on Our App!
Download our app for free and access thousands of MCQ questions with detailed solutions