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

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Solution

$\begin{matrix} (3 x + 7) (3 x - 7) (9 x^{2} + 49) \Rightarrow (9 x^{2} - 49) (9 x^{2} + 49) [a^{2} - b^{2} = (a - b) (a + b)] \Rightarrow (81 x^{4} - 2401) \end{matrix}$

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\frac{9 x - 7}{3 x + 5} = \frac{3 x - 4}{x + 6}

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