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question refers to class 11th maths..chapter Limits and derivatives......We have to find the limt of this qustion....Lim(x-0) (x+1)^5 - 1 / x . I got solution to this qustion on topperlearnign bu i have doubt....

Solution Says - Put x+1 = y so that y -> as x - 0[my question is why do they put x+1 = y ]

lim(x-0) (x+1)^5 - 1 / x = lim(y-1) y^5 -1 / y-1

lim(y-1) y^5-1^5 / y-1

5.1 ^ 5-1

=5

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