What is the domain of the function y=3v6x+42?

Question

y=3√6x+42

Answer 1

The domain is whatever x input we use and get a viable output. With square roots, this means we have to pay attention to what is underneath the root function:

6x + 42 ≥ 0

 

So we need to isolate x:

6x ≥ -42

x ≥ -7

 

So the domain of this function is everything x ≥ 7