Is this an Onto Function?

Algebra Level 4

Let \(f: \mathbb R \rightarrow \mathcal B\) is given by

\[\large f(x)=\frac{2x^8+6x^4+4x^2+3}{x^8+3x^4+2x^2+1}\]

How many integral values does \( \mathcal B \) includes for \(f(x)\) to be onto function?


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