Question

Find the product:

(x − 6)(4x + 9)

Answer 1

$$\begin{gathered} (\mathrm{x}-6)(4\mathrm{x}+9) \\ =\mathrm{x}\times (4\mathrm{x}+9)-6\times (4\mathrm{x}+9) \\ =(\mathrm{x}\times 4\mathrm{x}+\mathrm{x}\times 9)-(6\times 4\mathrm{x}+6\times 9) \\ =4{\mathrm{x}}^2+9\mathrm{x}-24\mathrm{x}-54 \\ =4{\mathrm{x}}^2-15\mathrm{x}-54 \end{gathered}$$