设函数f（x）= x2+2 (x≥2) 2x (x＜2) ,则f(-4)=_ ,若f（x0）=8,则x0=．设函数f（x）= x2+2 (x≥2)\x052x (x＜2) \x05 ,则f(-4)=_ ,若f（x0）=8,则x0=____．

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$设函数f（x）= x2+2 (x≥2) 2x (x＜2) ,则f(-4)=_____ ,若f（x0）=8,则x0=______．设函数f（x）= x2+2 (x≥2)\x052x (x＜2) \x05 ,则f(-4)=_____ ,若f（x0）=8,则x0=______．$

设函数f（x）= x2+2 (x≥2) 2x (x＜2) ,则f(-4)=_____ ,若f（x0）=8,则x0=______．设函数f（x）= x2+2 (x≥2)\x052x (x＜2) \x05 ,则f(-4)=_____ ,若f（x0）=8,则x0=______．
设函数f（x）= x2+2 (x≥2) 2x (x＜2) ,则f(-4)=_____ ,若f（x0）=8,则x0=______．
设函数f（x）=
x2+2 (x≥2)\x052x (x＜2) \x05 ,则f(-4)=_____ ,若f（x0）=8,则x0=______．

设函数f（x）= x2+2 (x≥2) 2x (x＜2) ,则f(-4)=_____ ,若f（x0）=8,则x0=______．设函数f（x）= x2+2 (x≥2)\x052x (x＜2) \x05 ,则f(-4)=_____ ,若f（x0）=8,则x0=______．
-8 ；根号6

f(-4)=-8;x0=根号6