Question

Find the product:

9x²(5x + 7)

Answer 1

$$\begin{gathered} =9{\mathrm{x}}^2\times 5\mathrm{x}+9{\mathrm{x}}^2\times 7 \\ =9\times 5\times {\mathrm{x}}^2\times \mathrm{x}+9\times 7\times {\mathrm{x}}^2 \\ =45{\mathrm{x}}^{(2+1)}+63{\mathrm{x}}^2 \\ =45{\mathrm{x}}^3+63{\mathrm{x}}^2 \end{gathered}$$