Given f(x)=x^4(2x^2-15). On what interval(s) is the graph of f concave upwards?

A. (0, sqrt(3))
B. (-sqrt(3), 0)
C. (-sqrt(3), 0) and (0, sqrt(3))
D. (-sqrt(3), sqrt(3))
E. (Negative infinity, -sqrt(3)) and (sqrt(3), infinity)

I got E

1 answer

looks good to me.

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