Question

函數(shù)y=的值域是________.

Answer 1

解析:由得x≥-2,即函數(shù)的定義域為［-2,+∞).

∴當(dāng)x≥-2時,y′＞0.

∴函數(shù)y=在(-2,+∞)上是增函數(shù).而f(-2)=-1,∴y=的值域是［-1,+∞).

答案:［-1,+∞).