If mc018-1.jpg and g(x) = 5x – 4, what is the domain of mc018-2.jpg?

First, we work out the composite function fg(x)



We need to check the expression of the denominator for the value of x that would make .




We cannot have  because we cannot have zero value for denominator

The value for x in fg(x) can be any number apart from 

Correct third option {x | x≠4/5}

Letter c i’d say