In the quadratic trend model,y_t = β₀ + β₁t² + ε_t,which coefficient determines if the trend is going to be U-shaped or inverted U-shaped?

Name: In the quadratic trend model,y t = β 0 + β 1 t 2 + ε t ,which coefficient determines if the trend is going to be U-shaped or inverted U-shaped?
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The Answer of In the quadratic trend model,y_t = β₀ + β₁t² + ε_t,which coefficient determines if the trend is going to be U-shaped or inverted U-shaped?

In the Quadratic Trend Model,yt = β0 + β1t2

In the Quadratic Trend Model,y_t = β₀ + β₁t²