c) 8y^3 – 12y^2 + 6y – 1;
c) 8y3 – 12y2 + 6y – 1;
c) 8y3 – 12y2 + 6y – 1 = (2y)3 – 3 . (2y)2 . 1 + 3 . 2y . 1 – 13 = (2y – 1)3;