f(x)=6x and g(x)= x+8 find the domain of f

Question

I need to know the domain and he range of f the zero of f f(-4.5) the intervals on which f is increasing and decreasing

 

Answer 1

Hi Twana,

 

Domain basically is the set of numbers the variable can take and still be defined. The variable x in both of your functions take any real number and, because of that the y, the dependent variable, also will include all real numbers as its range. Therefore 

 

Domain(f(x))=Domain(g(x))=(-∞,∞)

 

Zero(f(x))=>6x=0=> x=0

Zero(g(x))=>x+8=0=> x=-8

I don't know what you mean by f(-4,5)

 

hope this helps