Question #156df

1 Answer
Aug 14, 2017

Answer:

#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#