设\(f(x) = a{x^2} + bx + 2\)是定义在\(\left[ {1 + a,2} \right]\)上的偶函数，则\(f\left ( {x}

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设\(f(x) = a{x^2} + bx + 2\)是定义在\(\left[ {1 + a,2} \right]\)上的偶函数，则\(f\left ( {x} \right )\)的值域是___．

参考答案：\(\left[ { - 10,2} \right]\)