Find the common factors of the given term.
2x , , 4
∵                                  2x = 1 × 2 × x = 1 × 2 × x
                                3x2 = 1 × 3 × x × x = 1 × 3 × x
and                                4 = 1 × 2 × 2 = 1 × 2 × 2
∴          the common factor = 1
Note: 1 is a factor of every term.
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