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
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2x2+9x+9 = (2x+3)(x+3) when factored
Prime factorization refers to integers.
It is: 3*3 = 9
3*3 = 9
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