y = 8x^3 - 2x^4 find intervals of the graph when it concaves downward. (negative infinity, 0) ( 2, positive infinity) am i correct?
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It's concave downwards if $\displaystyle y''<0$ and $\displaystyle y''(x)=24(x^2-2x)=24x(x-2)$ so...yeah you're right.
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