x+y=8, xy=15 হলে (x-y)4=?
Solution
Correct Answer: Option D
আমরা জানি, (x – y)² = (x + y)² - 4xy
= (8)² - 4×15
= 64 - 60 = 4
∴ x - y = 2
∴(x + y) + (x - y) = 8 + 2
= > 2x = 10
∴ x = 5
∴y = 8 - 5 = 3
সুতরাং, (x - y)⁴ = (5 - 3)⁴ = 24 = 16
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