3x2-7x+4 = (3x-4)(x-1) when factored
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x2+3x+8 is a trinomial But this quadratic equation will have no solutions because its discriminant is less than zero.
The given quadratic expression can not be factored as a perfect square.
Without knowing the plus or minus values of the given terms then it can't be considered to be a quadratic expression.
If you mean x^2 -12x+35 then it is a quadratic expression which can be factored in the form of (x-7)(x-5)
Factors are (7y - 3)(7y - 2) so it's not a perfect square.