May i know how to form quadratic equation for demand curve?

Data is shown below :

Unit Price (P) in $ Quantity Demanded (Q) in units

P Q

0 500

5 450

8 372

10 300

12 212

15 50

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- January 7th 2013, 04:57 PMjiawen921212Demand curve
May i know how to form quadratic equation for demand curve?

Data is shown below :

Unit Price (P) in $ Quantity Demanded (Q) in units

P Q

0 500

5 450

8 372

10 300

12 212

15 50 - January 7th 2013, 08:33 PMchiroRe: Demand curve
Hey jiawen921212.

Do you have to fit the curve through all the points or just find the best fit?

Also have you heard of least squares fitting?