\begin{array} { l } { \text { Show that. } } \\ { \text { (i) } ( 3 x – InterviewSolution

1.	\begin{array} { l } { \text { Show that. } } \\ { \text { (i) } ( 3 x + 7 ) ^ { 2 } - 84 x = ( 3 x - 7 ) ^ { 2 } } \end{array}
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