It is necessary to find the smallest and greatest value of y=13x^3-2x^2+3 function on [-1;2]

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The Aibolshy and smallest value of function on a piece should be looked for among its extrema and on piece borders. Let's find extrema of function x=0, x=1 we check points 0, 1 and 8 (piece border) y(0)=0 y(1)=3/2-1/3=(9-2)/6=7/6=1 1/6 y(8) = the answer: y (8)=-164 2/3 - the smallest value, and y(1)=1 1/6 - the greatest
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