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Share/Save/Bookmark Login/ Register to Bookmark Topic : "Algebra-1" Started by Optimus

Optimus

#1 Posted 09:25am 21-03-09  

Algebra-1

the number of terms of expansion with reational co-efficients in the expansion of ([crt]5[/crt]+[sqrt]3[/sqrt]+z)[p]6[/p] is

a) 7 b) 6 c)8 d)9
cet on 12th may    

dimensions

#2 Posted 11:49am 21-03-09  

Re: Algebra-1

[b]there will be 7 rational terms

5[p]1/3[/p]   3[p]1/2[/p]   z

6         0       0
3         2       1
3         0       3
0         6       0
0         4       2  
0         2       4
0         0       6 [/b]
"Some people are always grumbling because roses have thorns; I am thankful that thorns have roses.”  Edited on 11:52am 21-03-09    

skygirl

#3 Posted 11:59am 21-03-09  

Re: Algebra-1

yes 7 rational terms but chcek your method naa...
http://skygirl-tete-a-tete.blogspot.com/ [phool bankar muskurana, zindagi hai... muskurake gham bhulana, zindagi hai... jeet kar koi khush ho toh kya hua?? ... sab kuchh har kar khushiyaan manana, ZINDAGI hai... :) ]    

dimensions

#4 Posted 0:03pm 21-03-09  

Re: Algebra-1

[b]is nything wrong !!! in my method

then do correct me[/b]
"Some people are always grumbling because roses have thorns; I am thankful that thorns have roses.”    

skygirl

#5 Posted 0:06pm 21-03-09  

Re: Algebra-1

([p]3[/p]√5+√3+z)[p]6[/p]

= [([p]3[/p]√5+(√3+z)][p]6[/p]

t[ss]r+1[/ss] = [p]6[/p]C[ss]r[/ss] 5[p]6-r/3[/p](√3+z)[p]r[/p]      [r<=6]

t[ss]k+1[/ss] = [p]r[/p]C[ss]k[/ss]z[p]r-k[/p]3[p]k/2[/p]       [k<=r]

now tr+1 is ratioal if r=0,3,6..

and tk+1 is raional for k=0,2,4,6

so,  r         k
     0         0
     3         0,2
     6         0,2,4,6.

so 7 rational terms.
http://skygirl-tete-a-tete.blogspot.com/ [phool bankar muskurana, zindagi hai... muskurake gham bhulana, zindagi hai... jeet kar koi khush ho toh kya hua?? ... sab kuchh har kar khushiyaan manana, ZINDAGI hai... :) ]    

skygirl

#6 Posted 0:07pm 21-03-09  

Re: Algebra-1

no i saw it before you edited....

but still y do it by table form... u may miss some term...

i dunno if u are comfortable its ok :)

actually i feel confused with that method...
http://skygirl-tete-a-tete.blogspot.com/ [phool bankar muskurana, zindagi hai... muskurake gham bhulana, zindagi hai... jeet kar koi khush ho toh kya hua?? ... sab kuchh har kar khushiyaan manana, ZINDAGI hai... :) ]    

theprophet

#7 Posted 0:14pm 21-03-09  

Re: Algebra-1

@sky multinomial would be better than binomial
   

skygirl

#8 Posted 0:18pm 21-03-09  

Re: Algebra-1

@dimension,...okie..it depends.

@prophet sir, will u pls solve this one by multinomial..
i actually dunno it .. [2]
http://skygirl-tete-a-tete.blogspot.com/ [phool bankar muskurana, zindagi hai... muskurake gham bhulana, zindagi hai... jeet kar koi khush ho toh kya hua?? ... sab kuchh har kar khushiyaan manana, ZINDAGI hai... :) ]    
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