= 9( k + 1) (8 + 1)

= 8. 9( k + 1) + 9( k + 1)


can anyone explain me 2 step how it came...please it is of example no 1.

we can write 9k+1 as ; -  9k .9

so, by multiplying with (8+1)

we  get ,    8.9k+1 + 9k+1 .

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