C-03-Q054mediumsingle_mcqIf a−b=4a-b=4a−b=4 and ab=60ab=60ab=60, (a+b)2=?(a+b)^2 = ?(a+b)2=?a256256256b244244244c272272272d646464ব্যাখ্যাUsing (a+b)2=(a−b)2+4ab(a+b)^2=(a-b)^2+4ab(a+b)2=(a−b)2+4ab, substitute a−b=4a-b=4a−b=4 and ab=60ab=60ab=60: 42+4(60)=16+240=2564^2+4(60)=16+240=25642+4(60)=16+240=256.