Question

Find the domain of this function:

f(x) = 64
------
sqrt(x-49)

a. {x l x > 64}
b. {x l x > 8}
c. {x l x > 49}
d. NONE OF THESE
e. {REAL NUMBERS}
f.
{ x l x > 7}

Answer 1

x>49

sqrt only defined on positive numbers, so only when x is greater than 49

Answer 2

whatever makes the denominator 0 (or undefined) is not allowed to be part of the domain.