Question

Find the product:

(5y − 1)(3y − 8)

Answer 1

$$\begin{gathered} (5\mathrm{y}-1)(3\mathrm{y}-8) \\ =5\mathrm{y}\times (3\mathrm{y}-8)-1\times (3\mathrm{y}-8) \\ =(5\mathrm{y}\times 3\mathrm{y}-5\mathrm{y}\times 8)-(3\mathrm{y}-8) \\ =15{\mathrm{y}}^2-40\mathrm{y}-3\mathrm{y}+8 \\ =15{\mathrm{y}}^2-43\mathrm{y}+8 \end{gathered}$$