Q. 143.7( 3 Votes )

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Answer :

Given, , we need to find value of n

So we will first find the limit and then equate it with 405 to get the value of n.

We need to find the limit for: As limit can’t be find out simply by putting x = a because it is taking indeterminate form(0/0) form, so we need to have a different approach.

Let, Z = Note: To solve the problems of limit similar to one in our question we use the formula mentioned below which can be derived using binomial theorem.

Formula to be used: As Z matches exactly with the form as described above so we don’t need to do any manipulations–

Z = Use the formula: Z = 5(a)5–1 = 5a4

According to question Z = 405

5(a)4 = 405

a4 = 81 = 34 or (–3)4

Clearly on comparison we have –

a = 3 or –3

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