Consider $-36x^{2}+60xy-25y^{2}$. Consider $-36x^{2}+60xy-25y^{2}$ as a polynomial over variable $x$.
$$-36x^{2}+60yx-25y^{2}$$
Find one factor of the form $kx^{m}+n$, where $kx^{m}$ divides the monomial with the highest power $-36x^{2}$ and $n$ divides the constant factor $-25y^{2}$. One such factor is $6x-5y$. Factor the polynomial by dividing it by this factor.