Posted by Sam on Thursday, January 7, 2010 at 5:43pm.
I am confused on how to determine if an equation/expression is a trinomial square. For example c^2(squared)18c+81. I know that this is a trinomial square but I don't know why. Could someone please help me understand better

algebra  bobpursley, Thursday, January 7, 2010 at 5:54pm
it is, because (c9)^2 = c^218c+81