Question

помогите решить задание ​

Answer 1

$1)4x^{2}y^{2}-9a^{4} =(2xy)^{2} -(3a^{2})^{2}=\boxed{(2xy-3a^{2})(2xy+3a^{2})}\\\\\\2)25a^{2}-(a+3)^{2}=(5a)^{2} -(a+3)^{2}=(5a -a-3)(5a+a+3)=\\\\=(4a-3)(6a+3)=\boxed{3(4a-3)(2a+1)} \\\\\\3)27a^{3}+c^{3}=(3a)^{3}+c^{3} =\boxed{(3a+c)(9a^{2}-3ac+c^{2})}$