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我们把形如f(x)=ax3+bx2+cx+d(a≠0)的函数称为三次函数,很显然,其定义域和值域都是R,在这里我们通过二次函数的图象和性质研究一下三次函数的单调性和极值及图象的大体形状.
We call a function of the form f(x)=ax3+bx2+cx+d(a≠0) as a cubic function. Obviously, both its domain and its domain are R. Here we pass a graph of a quadratic function. The image and properties investigate the monotonicity and extrema of the cubic function and the general shape of the image.