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4c^2-12c+9 is a trinomial because it is in the form of ax^2 + bx + c. In this case, the trinomial is a perfect square trinomial. 4c^2-12c+9 =(2c-3)(2c-3) =(2c-3)^2
5
Factors are (7y - 3)(7y - 2) so it's not a perfect square.
(x+2)(x-3)
9x+3