Answer: (5x - y)(25x^2 + 5xy + y^2) if the question wants us to write the facotred version of this expression.Step-by-step explanation:125x^3 - y^3Not certain what the question is. Since this is the difference of cubes x^3 and y^3), let's assume we want to put this into factored form.We know that: (a - b)(a^2 + ab + b^2)1) a must be 5x since (5x)^3 = 125x^32) b = y, since b^3 = y^3Rewriting: (a - b)(a^2 + ab + b^2) (5x - y)((5x)^2 + 5xy + y^2) (5x - y)(25x^2 + 5xy + y^2)