Formula 1

$$\mathrm{y}=\alpha+\beta \mathrm{x}+\gamma \mathrm{x}^{2}+\epsilon,$$

Formula 2

$$a = \overline {y} - b\left( \sum \frac {x} {n}\right) - c\left( \sum \frac {x^{2}} {n}\right)$$

Formula 3

$$b = \frac {(\sum X_{1}Y)(\sum X_{2}^{2}) - (\sum X_{2}Y)(\sum X_{1}X_{2})} {D}$$

Formula 4

$$c = \frac{(\sum X_2 Y)(\sum X_1^2) - (\sum X_1 Y)(\sum X_1 X_2)}{D}$$