Factor by grouping. Thanks! 

2a^3+a^2-14a-7





Be sure to group term to have a common factor



    (2a^3 - 14a) + (a^2 - 7)

  2a(a^2 - 7) + 1(a^2 - 7)



  (2a + 1) (a^2 - 7)





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