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First factor = 5y, giving 5y.(y2 - 25), so full factorisation is 5y.(y + 5)(y - 5)
5y3 - 125y = 5y(y2-25) = 5y (y+5)(y-5)
3(3x - 5y)(3x + 5y)
x2 + 8xy + 15y2 = (x + 3y) (x + 5y)
(8x + 5y)(64x^2 - 40xy + 25y^2)
One such expression is 5n