# 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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