In the model y = a0 + a1x + a2x2, what is the value of a2 if the relationship between y and x is linear?

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In the model y = a<sub>0</sub> + a<sub>1</sub>x + a<sub>2</sub>x<sup>2</sup>, what is the value of a<sub>2</sub> if the relationship between y and x is linear?