a+b = 7 এবং ab = 10 হচ্ছে (a -b)2 এর মান কত?

A 7

B 9

C 11

D 13

Solution

Correct Answer: Option B

দেওয়া আছে,
a + b = 7
এবং ab = 10

আমরা জানি,
(a - b)2 = (a + b)2 - 4ab
            = 72 - 4 × 10
            = 49 - 40
            = 9

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