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April 1, 2015

Posted by **Kathy** on Friday, August 5, 2011 at 5:18pm.

a. (-infinity, 4)

b. (-infinity, 4]

c. (4, infinity)

d. [4, infinity)

e. (4, 7) U (7, infinity)

- math -
**Damon**, Friday, August 5, 2011 at 5:31pm(x-7)/sqrt(4-x)

If x >4 , the result is imaginary because the denominator is the square root of a negative number so we know x<4 but we also know that the result is undefined for x = 4

so

x < 4 or from -00 to 4 not including 4

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