已知函数f(x)=kx^3+3(k-1)x^2-k^2+1(k扫码下载作业帮拍照答疑一拍即得
问题描述:
已知函数f(x)=kx^3+3(k-1)x^2-k^2+1(k
扫码下载作业帮
拍照答疑一拍即得
答
已知函数f(x)=kx^3+3(k-1)x^2-k^2+1(k解析:∵函数f(x)=kx^3+3(k-1)x^2-k^2+1
f’(x)=3kx^2+6(k-1)x=0
x1=0
f”(x)=6kx+6(k-1)==> f”(0)=6(k-1)kx2=2(1-k)/k=4==>k=1/3
∴k=1/3