2 quick question...

My Question: What is the domain and range of: n(x)= -2m(-2x)

n(x) = -2m(-2x) which simplifies to n(x) = -4mx

Not sure what to do here

Similar Question: What is the domain and range of: m(x): (the square root of) x+2

m(x): (the square root of) x+2

Domain: x+2 = 0

.............x=-2

Domain = X3R but can cannot be 2

I'm not sure if the last two lines are right? Can someone check them for me please?