Math Is Fun Forum

Angel Rox

Member

Registered: 2008-11-10

Posts: 15

Need help in solving...urgent plz

Q1 - Use Newton's method to find the value of x for the function f(x)=2x^2 + 4x - 3 = 0 ; x > 0
Note : Perform only 3 iterations.

Q2 - Evaluate the integral ∫ (1 + sinx)^6 cosxdx by proper substitution.

Q3 - Evaluate the sum ∑ k(k - 2)(k + 2) using the required theorems.

Note on this sign "∑" on the upper side it is 35 and on the lower side it is k-1....I dont know how to use the tags here coz am new...sorry plz...

Help me in this

Ricky

Moderator

Registered: 2005-12-04

Posts: 3,791

Re: Need help in solving...urgent plz

If you need any more help than this, I recommend posting what you're thinking for the problems.  It shows us where your thinking is wrong or incomplete.

1. Do you know the formula for Newton's Method?  If yes, post it, and please tell us what difficulty you are having with using it.

2. When it comes to substitution, you have very few choices.  Remember that once you pick u, du needs to appear in the integrand.

3. Are you saying the sum is:

Because that doesn't make sense.

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"In the real world, this would be a problem.  But in mathematics, we can just define a place where this problem doesn't exist.  So we'll go ahead and do that now..."