C-03-Q055mediumsingle_mcqIf a+b=9ma+b=9ma+b=9m and ab=18m2ab=18m^2ab=18m2, (a−b)2=?(a-b)^2 = ?(a−b)2=?a9m29m^29m2b81m281m^281m2c000d27m227m^227m2ব্যাখ্যাUsing (a−b)2=(a+b)2−4ab(a-b)^2=(a+b)^2-4ab(a−b)2=(a+b)2−4ab, substitute a+b=9ma+b=9ma+b=9m and ab=18m2ab=18m^2ab=18m2: (9m)2−4(18m2)=81m2−72m2=9m2(9m)^2-4(18m^2)=81m^2-72m^2=9m^2(9m)2−4(18m2)=81m2−72m2=9m2.