IMathAS-libretexts

The function

\displaystyle {f{{\left({x}\right)}}}=-{2}{x}^{{3}}+{9}{x}^{{2}}+{108}{x}+{2}

is increasing on the interval ( , ).

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\displaystyle

Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity

Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity