⑩天掌 Teaching Plan on Advanced Mathematics o 在点(-3,2)处,AC-B2=-126>0,又 A<0,所以函数在(-3,2)处有极大值 ∫(-3,2)=31 tianjin polytechnic dmivendityTianjin Polytechnic University Teaching Plan on Advanced Mathematics 12 6 0, 2 AC - B = -  > A < 0, 在点 (-3,2) 处， 又 所以函数在 (-3,2) 处有极大值 f (-3,2) = 31