Find the largest open intervals where the function is concave upward.
-$f(x)=x^{4}-8 x^{2}$ (exact values)
A) None
B) $\left(-\infty,-\frac{2}{\sqrt{3}}\right),\left(\frac{2}{\sqrt{3}}, \infty\right)$
C) $\left(\frac{2}{\sqrt{3}}, \infty\right)$
D) $\left(-\infty,-\frac{2}{\sqrt{3}}\right)$

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The Answer of Find the largest open intervals where the function is concave upward.
-$f(x)=x^{4}-8 x^{2}$ (exact values)
A) None
B) $\left(-\infty,-\frac{2}{\sqrt{3}}\right),\left(\frac{2}{\sqrt{3}}, \infty\right)$
C) $\left(\frac{2}{\sqrt{3}}, \infty\right)$
D) $\left(-\infty,-\frac{2}{\sqrt{3}}\right)$

Find the Largest Open Intervals Where the Function Is Concave f(x)=x4−8x2f(x)=x^{4}-8 x^{2}f(x)=x4−8x2

Find the Largest Open Intervals Where the Function Is Concave $f(x)=x^{4}-8 x^{2}$