Just to clarify on how to factor a perfect square trinomial:
You take the square root of a term (the first term in the expression) and the square root of the c term (the last term) and multiply them together and then multiply what you get by two. If that is the middle term then you have a perfect square trinomial.
a^2 -(2)(a)(c) + c^2
(a-c)^2
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