x + y = 6 এবং xy = 8 হলে (x - y)2 এর মান কত?

A 8

B 6

C 4

D 12

Solution

Correct Answer: Option C

দেয়া আছে ,
     x + y = 6 এবং xy = 8
  ∴ (x - y)² = (x + y)² - 4xy
                 = (6)² - 4 × 8
                 = 36 - 32
       ∴ (x - y)² = 4

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