Question

Find the domain of each rational expression. f(x)=5x-7/4

Answer 1

 $f(x)=5x-\frac{7}{4}$

The function is defined for all real numbers x

 D=R

Answer 2

$1)\ \ \ f(x)=5x- \frac{7}{4} \ \ \ \Rightarrow\ \ \ D_f=R\\\\2)\ \ \ f(x)= \frac{5x-7}{4} \ \ \ \Rightarrow\ \ \ D_f=R$