Expand each of the following expressions.(step by step)
(a) (x – 3)(x + 1)
(b) (x + 2)(x + 4)
(c) (1 – 7x)(11x – 4)
(d) (4 – 3x)(2 – 3x)
(e) (2x – 5)(7x – 11)
(f) (6 – d)(2d – 5)