Answers

2014-06-10T11:57:39+08:00
(5d-7d^2t)^2=(5d-7d^2t)(5d-7d^2t)
1 5 1
25d-14d^2t+49d^4t^2
how about the 2nd one??
(7q^2w^2-4w^2)^2=(7q^2w^2-4w^2)(7q^2w^2-4w^2)
49q^4w^4-8w^4+16w^4
correction: 49q^4w^4-8w^2+16w^4
9234^(0312^0)