Question 847481
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
(a + b)^3 = a^3 + 3a^2b + 3ab^2+ b^3 
(a +(- b))^3 = (a-b)^2 =  a^3 - 3a^2b + 3ab^2- b^3