Without knowing the plus or minus values of the given terms then it can't be considered to be a quadratic expression.
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Yes; the factored form would be (9c+4)(9c+4) or just (9c+4)2 Since the two factors are the same, the beginning trinomial 81c2+72c+16 is a perfect square trinomial
yes, (7x - 4)2
(x - 14)(x - 2)
x + 4