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4c+1-5+2c = 6c-4.
4c2 + 5c + 2c = 4c2 + 7c = c(4c + 7)
6c-4c =2c
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
12-2c = 2c add 2c to both sides 12 = 4c divide both sides by 4 3 = c