If a = 2, b = -3, then the value of 27a3 - 54a2b + 36ab2 - 8b3 is?

Answer: Option D

$$\begin{array}{rl}& a=2,b=-3\\ & \text{So,}27a^3-54a^{2}b+36a{b}^2-8b^3\end{array}$$
$$=27\times {\left(2\right)}^3-54\times {\left(2\right)}^2\times \left(-3\right)+$$       $$36\times$$ $$\left(2\right)\times$$ $${\left(-3\right)}^2$$ $$-8\times$$ $${\left(-3\right)}^3$$
$$\begin{array}{rl}& =27\times 8-54\times 4\times -3+36\times 2\times 9-8\times -27\\ & =216+216+648+648\\ & =1728\end{array}$$