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Answer :

GCF = Greatest Common Factor

Therefore,

prime factor of 42

[tex]42\text{ = }2\times3\times7[/tex]

prime factor of 36

[tex]36=2\times2\times3\times3[/tex][tex]As\text{ 2}\times3=6,\text{ GCF=6}[/tex]

Therefore,

[tex]42+36=6\times7+6\times6=6\times(7+6)[/tex]

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