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+0  
 
-1
238
2
avatar+1405 

help me Please

 

Binomial Theorem

 

Find the indicated term of the expansion.

 

4th term of (4x-y)^9

 Jan 29, 2018
 #1
avatar+100800 
+2

4th term of (4x-y)^9

 

The forth term from what end .. I never know what people want when they say this.

 

\(9C3(4x)^3(-y)^6 = 84*64x^3y^6=5376x^3y^6\)         (Edited)

 

or

 

\(9C3(4x)^6(-y)^3=-84*4096x^6y^3=-344064x^6y^3 \)         (Edited)

 

 

As Omi pointed out, I had mistakenly omitted the minus sign in front of the y. 

I also made a mistake with the C value.

Thanks Omi :)

 

Omi you also made a small mistake as  28+56=84 NOT 54

.
 Jan 29, 2018
edited by Melody  Jan 29, 2018
 #2
avatar+10355 
+1

help me Please

 

Binomial Theorem

Find the indicated term of the expansion.

4th term of (4x-y)^9

laugh

 Jan 29, 2018

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