x^4+ax+b chia hết cho x^2-4
=>x^4+ax+b chia hết cho x-2 và x+2
x^4+ax+b=(x-2)(x^3+2x^2+4x+a+8)+(b+2(a+8))
x^4+ax+b chia hết cho x-2=>b+2(a+8)=0
x^4+ax+b=(x+2)(x^3-2x^2+4x+a-8)+(b+2(8-a))
x^4+ax+b chia hết cho x+2=>b+2(8-a)=0
=>b+2(a+8)=b+2(8-a)
<=>2a+16=16-2a
<=>4a=0
<=>a=0=>b=-16
Tại a=0,b=-16 ,giá trị của a+b=0+(-16)=-16
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