Объяснение:
(5х – Зу)^2 - 16х^2=(5х – Зу)^2 - (4х)^2=
=(5x - 3y - 4x)(5x - 3y + 4x)=(x - 3y)(9x - 3y)=
=3(x - 3y)(3x - 1)
