Simplify: (x + y)3 - (x - y)3 - 6y(x2 - y2)
Factorise each of the following:
a4 - b4 (b)a4 - 16b4
a4 - 16b4
a4 - 16b4 = (a2)2 - (4b2)2 = (a2 - 4b2)(a2 + 4b2)| Using Identity III= {(a)2 - (2b)2}(a2 + 4b2)= (a + 2b)(a - 2b)(a2 + 4b2)| Using Identity III
a2 - (b - c)2