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A function is shown: $f(x)=36 x^{2}-1$.$\newline$Choose the equivalent function that best shows the $x$-intercepts on the graph. ($1$ point)$\newline$$f(x)=18\left(x^{2}-1\right)$$\newline$$f(x)=(18 x+1)(18 x-1)$$\newline$$f(x)=6\left(x^{2}+1\right)$$\newline$$f(x)=(6 x+1)(6 x-1)$