a - b = 3, ab = 4 হলে a2 + b2 এর মান কত?

A 17

B 18

C 16

D 20

Solution

Correct Answer: Option A

a - b = 3
ab = 4

আমরা জানি
⇒ (a - b)2 = a2 + b2 - 2ab
⇒ 32 = a2 + b2 - 2 × 4
⇒ 9 + 8 =  a2 + b2
⇒ a2 + b2 = 17

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