已知函数f(x)=(x-x²)(x²+ax+b)(x∈R),若f(x-1)是偶函数,则f(x)的值域是
问题描述:
已知函数f(x)=(x-x²)(x²+ax+b)(x∈R),若f(x-1)是偶函数,则f(x)的值域是
答
f(x-1)是偶函数则f(-x-1)=f(x-1)f(x-1)=[(x-1)-(x-1)^2][(x-1)^2+a(x-1)+b]f(-x-1)=[(-x-1)-(-x-1)^2][(-x-1)^2+a(-x-1)+b]则a=-1,b=1f(x)=(x-x²)(x²-x+1)= -1/4-(x^2-x+1/2)^2=-1/4-[(x-1/...