Answer
14(1+3)
Explanation
The greatest common factor of 14 and 42 is 14.
Divide 14 and 42 each by 14.
14÷14=1
42÷14=3
So 14+42 factored is 14(1+3).
You can also check your answer.
1+3=4
14×4=56
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14+42=56
