BD Merit - Freelancing, BCS, Bank, Primary, Admission, NTRCA

1 . x+y=8,xy==15

A. 4
B. 8
C. 9
D. 16

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Answer: Option D

Explanation:

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.

2 . x+y=8,xy==15

A. 4
B. 8
C. 9
D. 16

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Answer: Option D

Explanation: