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導函數在x=0時為0，在-1＜x＜0時和0＜x＜1時為負，所以在x=-1時，導數左正右負，有極大值4，在x=1時，導數左負右正，有極小值0，
Mathematics
Senior High
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在複習高三課本，請問接下來怎麼算？
隨堂練習
求函數f(x)=3x−5x+2的極值。
f(x)=15x-15x
=15x(x-1)=15x(x+1)(x-1)
f(x)+0+0+
利用多項式函數的極值可以反求此函數,舉例如下。
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