y=square root of x+2 find domain

Question

hard question help

Answer 1

Assuming y = √(x + 2)

 

If the solution is over the set of reals, ℜ, the argument, x + 2, may not be negative.

 

x ∈ {x | x ≥ -2}

Answer 2

y=√x+2

 

squaring on both sides,we get

 

y² = x+2

 

x=y² -2