How would you answer this?

Question

Which of the following parent functions does not have a domain of all real numbers?

a) Cubic

b) Rational

c) Absolute Value

d) Exponential

Answer 1

Rational

The answer is B...

Rational

Rational functions have the variable in the denominator

which means the denominator can be zero for certain values

of x. The values of x that make the denominator zero are NOT in

the domain which means the domain is NOT all REals