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1. a + b = 9, a - b = 7 হলে ab কত?
- A. 7
- B. 7
- C. 7
- D. 7
Answer: Option D
Explanation:
দেওয়া আছে, a + b = 9 এবং a - b = 7
∴ab = {(a + b)2 - (a - b)2}/4
= (92 - 72)/4
= (81 - 49)/4
= 32/4
= 8
Post your comments here:
1. a + b = 9, a - b = 7 হলে ab কত?
Answer: Option D
Explanation:
দেওয়া আছে, a + b = 9 এবং a - b = 7
∴ab = {(a + b)2 - (a - b)2}/4
= (92 - 72)/4
= (81 - 49)/4
= 32/4
= 8
Post your comments here: