determine if the second funtion is the inverse of the first

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determine if the second funtion is the inverse of the first function 数学题
determine if the second funtion is the inverse of the first function
y=2x^2-3, X<=0 second funtion y= 负* 根号（1/2（x+3））
我的结果是：y= 正负* 根号（1/2（x+3））请问X<=0 有什么意义?·
然后,restrict the domain so that the inverse of each funtion is a funtion .
restrict the domain X的取值范围?
题目是,y=x^2 -1 y=(x+1)^2 y=(x-2)^+1
X取值范围是R啊.我知道怎样 inverse funtion 但是 "规定范围使inverse funtion is a funtion" 又是怎么做呢?

y=2x^2-3,X

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