Question

HELP!! please explain your answer, so I'll have a better understanding. ​

Answer 1

`\textit{difference of squares} \\\\ (a-b)(a+b) = a^2-b^2 \\\\[-0.35em] ~\dotfill\\\\ 36x^2-49\implies 6^2 x^2 - 7^2\implies (\underset{a}{6x})^2 - (\underset{b}{7})^2\implies \underline{(6x-7)}(6x+7)`