Question

Find the product:

5a(6a − 3b)

Answer 1

$$\begin{gathered} =5\mathrm{a}\times 6\mathrm{a}-5\mathrm{a}\times 3\mathrm{b} \\ =5\times 6\times \mathrm{a}\times \mathrm{a}-(5\times 3\times \mathrm{a}\times \mathrm{b}) \\ =30{\mathrm{a}}^2-15\mathrm{ab} \end{gathered}$$