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1.Power Functions幂函数y=xμ(μ is a constant)
(1)When μ=n(where n is a positive integer)
When n is even, the function is also an even function(偶函数);
When n is odd, the function is also an odd function(奇函数);
(2)When μ= (where n is a positive integer)
When n is even, the domain of the function is (0,+∞);
When n is odd, the domain of the function is (-∞,+∞);
The following figure are the graphs of the functions when μ=-1, ,1,2.
2.Polynomial Functions多项式函数
多个幂函数进行加减乘运算即得到多项式函数,记为:
f(x)=a0xn+a1xn-1+a2xn-2+…+an-1x+an(n is a positive integer or zero)
n=1,linear function(一次函数),f(x)=kx+b(k≠0)
n=2,quadratic function(二次函数),f(x)=ax2+bx+c(a≠0)
n=3,cubic function(三次函数),f(x)=ax3+bx2+cx+d(a≠0)
3.Rational Functions有理函数
二个多项式函数进行除运算即得到Rational function,记为:
f(x)= (Q(x)≠0)[P(x) and Q(x) are polynomial functions]
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