d) 125x^3 + 27y^3;
d) 125x3 + 27y3;
d) 125x3 + 27y3 = (5x)3 + (3y)3 = (5x + 3y)[(5x)2 + 5x . 3y + (3y)2]
= (5x + 3y)(25x2 + 15xy + 9y2);