Question 816885
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Hi,
how to factor
The idea is to position the -4 and -1 so as SUM of the outside and the inside terms =  -13x
3x^2-13x+4 = (3x  __)(x  __) = (3x - 1)(x - 4)

                               F	First terms  3x^2
                               O	Outside terms -12x
                               I	Inside terms    -x
                               L	Last terms      4