x =5 এবং y = 2 হলে 16x2 + 56xy +49y2 - এর মান কত?

A ২০৪

B ১১৫৬

C ৩৬

D

Solution

Correct Answer: Option B

দেওয়া আছে,
16x2 + 56xy +49y2
=(4x)2 + 2 X 4x X 7y + (7y)2
= (4x + 7y)2
= (4 X 5 + 7 X 2)2
= (20 + 14)2
= 1156

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