C-03-Q047mediumsingle_mcqSquare of (4y−5x)=?(4y-5x) = ?(4y−5x)=?a16y2+40xy+25x216y^2 + 40xy + 25x^216y2+40xy+25x2b16y2−40xy+25x216y^2 - 40xy + 25x^216y2−40xy+25x2c16y2−25x216y^2 - 25x^216y2−25x2d4y2−40xy+5x24y^2 - 40xy + 5x^24y2−40xy+5x2ব্যাখ্যাUsing (p−q)2=p2−2pq+q2(p-q)^2=p^2-2pq+q^2(p−q)2=p2−2pq+q2 with p=4y, q=5xp=4y,\ q=5xp=4y, q=5x: (4y)2−2(4y)(5x)+(5x)2=16y2−40xy+25x2(4y)^2-2(4y)(5x)+(5x)^2=16y^2-40xy+25x^2(4y)2−2(4y)(5x)+(5x)2=16y2−40xy+25x2. The cross term is negative because of the subtraction.