The answer depends on the domain of f. With an unconstrained domain, the range is all real (or even complex) numbers.
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y = 3x + 2x^2 + k where k is any number
Y = x squared -4x plus 3 is an equation of a function. It is neither called a domain nor a range.
4x + 3 doesn't factor. It is in its simplest form.
It can't be simplified any more. That is the answer, 3*4X or 12x
If the question gives 4x-3=9, then we can solve: 4x-3=9 4x=6 x=3/2, or 1.5