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Factor by grouping 4v3 - 7v2 - 24v + 42

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4 v3 - 7v2 - 24 v + 42 =           We see that 24/ 4  & 42/ 7 are 6 so we group them                                                                   accordingly. 

4 v- 24 v - 7v2 + 42 =

4v ( v2 - 6 ) - 7 ( v2 - 6 ) =

( v- 6 ) ( 4V - 7 ).