A multiple regression model of the form = B₀ + B₁x + B₂x²+ B₃x³ + ε is called an expanded second-order polynomial since it contains all the terms up to x³ in the model at one time.

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The Answer of A multiple regression model of the form = B₀ + B₁x + B₂x²+ B₃x³ + ε is called an expanded second-order polynomial since it contains all the terms up to x³ in the model at one time.

A Multiple Regression Model of the Form = B0

A Multiple Regression Model of the Form = B₀