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1. x+y=12 ও x-y=2 হলে xy এর মান কত?
- A. 25
- B. 25
- C. 25
- D. 25
Answer: Option C
Explanation:
xy = {(x + y)² - (x - y)²}/4
বা, xy = {(12)² - (2)²}/4
বা, xy = (144 - 4)/4
বা, xy = 140/4
∴ xy = 35
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1. x+y=12 ও x-y=2 হলে xy এর মান কত?
Answer: Option C
Explanation:
xy = {(x + y)² - (x - y)²}/4
বা, xy = {(12)² - (2)²}/4
বা, xy = (144 - 4)/4
বা, xy = 140/4
∴ xy = 35
Post your comments here: