Answer :
If you put x=y in the given equation it would make no change to the equation as y will take place of x only, Thus what you get will be
[tex]lim_{y \to \ 0} [(y+1)^5 -1]/y[/tex] which is same as your given equation.
For finding a solution to any question the logic is to convert the question into general (predefined forms) which we have already learned.
The asked limit looks alot similar to the formula :
[tex] \lim_{x \to \(a} [x^n-a^n]/x-a [/tex] = [tex]n a^{n-1}[/tex]
So, for converting the above format in this predefined format we put x+1=y
Now [tex] {x \to \(0} \\ {y \to \(1}[/tex]
So we can write,
[tex] \lim_{y \to \(1} (y^5-1)/(y-1)[/tex]
Here a=1, n=5 so the solution is [tex]5[1^{5-1}][/tex] = 5
[tex]lim_{y \to \ 0} [(y+1)^5 -1]/y[/tex] which is same as your given equation.
For finding a solution to any question the logic is to convert the question into general (predefined forms) which we have already learned.
The asked limit looks alot similar to the formula :
[tex] \lim_{x \to \(a} [x^n-a^n]/x-a [/tex] = [tex]n a^{n-1}[/tex]
So, for converting the above format in this predefined format we put x+1=y
Now [tex] {x \to \(0} \\ {y \to \(1}[/tex]
So we can write,
[tex] \lim_{y \to \(1} (y^5-1)/(y-1)[/tex]
Here a=1, n=5 so the solution is [tex]5[1^{5-1}][/tex] = 5
it is common sense that to solve the limits you have to convert the question to a known form which you can solve. to do exactly that you have to do the operation that has been suggested.