若集合A={x|x=a2+2a+4,a∈R},B={y|y=b2-4b+3,b∈R},试确定集合A、B之间的关系

若集合A={x|x=a2+2a+4,a∈R},B={y|y=b2-4b+3,b∈R},试确定集合A、B之间的关系.

答案

解析:A={x|x=(a+1)2+3}={x|x≥3},

    B={y|y=(b-2)2-1}={y|y≥-1},

    ∴AB.

答案:AB

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