Question

Question #156df

Answer 1

`x in (-oo,oo)`
`yin (4,oo)`

Explanation:

Given `y=x^2+4`
So if we are interested in finding maximum or natural domain of `x` then `x` can take any real value as for every real value of `x` we get a real value of `y`.

But as for any real number, the square of any real number is always non negative and hence
`x^2>=0`
`=> x^2+4>=4`
`:. y>=4`