Homework Help: algebra

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 (c-9)^2 = c^2-18c+81

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