Correct Answer: Option B
x2 -8x-8y+16+y2
= x2 +y2 +(-4)2 + 2.x.y + 2.y (-4) + 2 (-4)x -2xy
= x2 +y2 +(-4)2 + 2xy - 8y - 8x -2xy
= (x+y-4)2 - 2xy
সুতরাং পূর্ণ বর্গ করতে হলে 2xy যোগ করতে হবে ।
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