Question

Find the product:

9t²(t + 7t³)

Answer 1

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