Question

(2m+3)v2 stepeni-9m v2 stepeni

Answer 1

$(2m+3)^{2} -9m^{2} = ((2m+3) - 9m)((2m+3) + 9m) =$
$=(3 - 7m) (11m+3) = 33m-21m+9-77m^{2} =$
$=-77m^{2}+12m+9$