已知f(x)=x2+bx+c,且g(x)=f(x)+f′(x)为偶函数,则f′(-1)=____________.

已知f(x)=x2+bx+c,且g(x)=f(x)+f′(x)为偶函数,则f′(-1)=____________.

答案

答案:

-4  【解析】本题考查导数的运算及偶函数的性质等知识.由题意,f(x)=x2+bx+c,所以f′(x)=2x+b,g(x)=f(x)+f′(x)=x2+(b+2)x+b+c是偶函数,所以需b+2=0,即b=-2.所以f′(-1)=2×(-1)-2=-4.

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