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Square root

  • Thread starter teng125
  • Start date
  • #1
416
0
sqrt(81t^4 + 18t^2 +1).can anybody teach me how to factorise this eqn so that the sqrt can be done pls

thanx
 

Answers and Replies

  • #2
416
0
i need to integrate this eqn w.r.t (t).
pls help
 
  • #3
nazzard
Gold Member
100
0
Hello teng,

make use of the binomial theorem.

[tex](a+b)^2=a^2+2ab+b^2[/tex]

The coefficient 81 should be a good hint already. :wink:

Regards,

nazzard
 
Last edited:
  • #4
nazzard
Gold Member
100
0
teng125 said:
i need to integrate this eqn w.r.t (t).
pls help
After you made use of the binomial theorem you will have to integrate a polynomial in t. Do you know how to do that?

Regards,

nazzard
 
  • #5
If the t^4 bothers you, substitute t^2 = r in the equation and then factorize the quadratic form. Don't forget to revert to t before you integrate.
 

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