PreCalculus 3: Graphing Polynomial & Rational Fcts (28 of 29) Polyn, Domain & Range=?, Syn Division

In this video I will demonstrate the 3-steps used to graph (with horizontal and vertical asymptotes) and find the domain and range of y=(2x^2-4x-5)/(x-3).

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[md.mominulislam]

sir, I couldn't still understand that how you make y=x-1. Could you please explain this.

[sonalitomar]

Domain can not take value from 1 to 3 as there is a constrain by line y=x-1. Am i correct?

[muradrzayev]

in order to simplify equation can not we multiple this with 1 over x square???