= √(25×6) x^4 - √(4×6)x^2y^4 + √(16×6)x^3y^3 =
5√6 x^4 - 2√6 x^2y^4 + 4√6 x^3y^3 =
√6 x^2 × (5x^2 - 2y^2 + 4xy^3)
