Question 822281
<pre>        _
y = 4-2&#8730;x

x must be non-negative, so the least value x can
take on is 0; thus its domain is [0,oo)

The largest possible value of y is when the least
amount is subtracted from 4, which is when x=0, and 
y=4,

so the range is (-oo,4]

{{{graph(400,400,-3,10,-6,7,4-2sqrt(x))}}}

Edwin</pre>