f(x+2)=xˆ2+1,则f(x)=( ) (A)xˆ2+3 (B)xˆ2-1 (C)xˆ2-4x+5 (D)x
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f(x+2)=xˆ2+1,则f(x)=()(A)xˆ2+3(B)xˆ2-1(C)xˆ2-4x+5(D)xf(x+2)=xˆ2+1,则f(x)=()
f(x+2)=xˆ2+1,则f(x)=( ) (A)xˆ2+3 (B)xˆ2-1 (C)xˆ2-4x+5 (D)x
f(x+2)=xˆ2+1,则f(x)=( ) (A)xˆ2+3 (B)xˆ2-1 (C)xˆ2-4x+5 (D)x
f(x+2)=xˆ2+1,则f(x)=( ) (A)xˆ2+3 (B)xˆ2-1 (C)xˆ2-4x+5 (D)x
令a=x+2
x=a-2
f(a)=(a-2)^2+1=a^2-4a+5
f(x)=x^2-4x+5
选C
C
(C)xˆ2-4x+5