53: \(=\left(5x-y\right)^2\)
54: \(=\left(x^2-2y^2\right)^2\)
55: \(=\left(3x-5\right)^2\)
56: \(=\left(3x^2-2y\right)^2\)
59: \(=x^6\left(x^2-4x+4\right)=x^6\left(x-2\right)^2\)
60: \(=x^6\left(9-12x+4x^2\right)=x^6\left(2x-3\right)^2\)
61: \(=\left(m+3\right)\left(m^2-3m+9\right)\)
62: \(=\left(x+2\right)\left(x^2-2x+4\right)\)


