Question: Determine whether the function is continuous on the entire real number line. Explain your reasoning. f ( x ) = 4 x 2 - 9

Determine whether the function is continuous on the entire real number line. Explain your reasoning.
f(x)=4x2-9
The function is continuous because the rational function's domain is the entire real line.
The function is not continuous because the rational function is not defined at x=3 only.
The function is not continuous because the function is not a polynomial.
The function is not continuous because the rational function is not defined at x=1.3.
The function is continuous because the function is a polynomial.
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