Q2. Factorise the following expressions 

(i)7x -42

Answers (1)

We have,
            7x = 7 \times x \\ 42=7\times 2 \times 3=7\times 6\\ 7x-42=7x-7\times 6=7(x-6)   

    Therefore,  7 is a common factor 

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