Please help!!!!
If f (x) = StartRoot 4 x + 9 EndRoot + 2, which inequality can be used to find the domain of f(x)?
a.) StartRoot 4 x EndRoot greater-than-or-equal-to 0
b.) 4 x + 9 greater-than-or-equal-to 0
c.) 4 x greater-than-or-equal-to 0
d.) StartRoot 4 x + 9 EndRoot + 2 greater-than-or-equal-to 0