Question

Solve the following:
$(\frac{2}{3}x+7)(\frac{2}{3}x-7)(\frac{4x^2}{9}x+49)$

Answer 1

$\begin{array}{c}\left(\frac{2x}{3}+7\right)\left(\frac{2x}{3}-7\right)\left(\frac{4x^2}{9}+49\right)\\ \Rightarrow \left(\frac{4x^2}{9}-49\right)\left(\frac{4x^2}{9}+49\right)\left[a^2-b^2=\left(a-b\right)\left(a+b\right)\right]\\ \Rightarrow \left(\frac{16x^4}{81}-2401\right)Ans.\end{array}$