a + b = 7 এবং ab = 10 হলে, a2 + b2 + 3ab = কত ?

A 29

B 59

C 49

D 69

Solution

Correct Answer: Option B

a ²+b ²+3ab
=a ²+b ²+2ab+ab
=(a+b)²+ab
=(7)²+10
=49+10
=59

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