Question

求f(x)=x的3次方—3x的极大值和极小值

Answer 1

f(x) = x³ - 3x

求导得：

f'(x) = 3x² - 3

令 3x² - 3 = 0

x = 1 或 x = -1

所以

极大值 = f(-1) = 2

极小值 = f( 1) = -2