Find the domain for each of the following functions. Present your answer in interval form, using exact values. Use exact values.

f(x)=12x2−8x\displaystyle {f{{\left({x}\right)}}}=\frac{{1}}{{{2}{x}^{{2}}-{8}{x}}}     domain:  

f(x)=2x2−8x\displaystyle {f{{\left({x}\right)}}}=\sqrt{{{2}{x}^{{2}}-{8}{x}}}     domain:  

f(x)=log⁡4(2x2−8x)\displaystyle {f{{\left({x}\right)}}}={{\log}_{{4}}{\left({2}{x}^{{2}}-{8}{x}\right)}}     domain:  

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