a + b = 7 এবং ab = 10 হলে, a2 + b2 + 3ab = কত?
সমাধান
সঠিক উত্তর: Option D
দেওয়া আছে, a + b = 7, ab = 10
∴ a2 + b2 + 3ab = (a + b)2 - 2ab + 3ab
= (a + b)2 + ab
= 72 + 10
= 49 + 10
= 59
∴ a2 + b2 + 3ab = (a + b)2 - 2ab + 3ab
= (a + b)2 + ab
= 72 + 10
= 49 + 10
= 59
