[tex]y=\sqrt{5x-1}\\\sqrt{5x-1}\\5x-1\\x\geq \frac{1}{5}\\[/tex]
x∈R
x∈[[tex]\frac{1}{5}[/tex],+∞>
[tex]y=\frac{1}{\sqrt{3-x}}\\y=\frac{1}{\sqrt{-x+3}}\\\frac{1}{\sqrt{-x+3}}\\\sqrt{-x+3}\\-x+3\\[/tex]
x∈R\{3}
x[tex]\leq[/tex]3
x∈<-∞,3>
[tex]y=\frac{1}{x^{2} -16}\\\frac{1}{x^{2} -16}\\x^{2} -16\\[/tex]
x∈R\{-4,4}
