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question 1

 Jan 16, 2020
 #1
avatar+11729 
+2

Do you know the Pascal triangle?

laugh

 Jan 16, 2020
edited by Omi67  Jan 16, 2020
 #3
avatar+1690 
+1

Woah thats a lot of infomation, but supringly it makes sense! Ill take note of using the pascale triangle.Thank yousmiley

jjennylove  Jan 16, 2020
 #2
avatar+109739 
+2

([1/2]x^3 y^2  - 4y)^9

 

The 5th term is given by

 

C(9, 5 - 1) [(1/2)x^3y^2 ]^5 * [ -4y]^(5 - 1)  =

 

C(9 , 4) * [ (1/2)^5 ] * [ x^3y^2]^5 *  [ -4]^(4) * (y)^4  =

 

126  * ( 1/32)  * [ x^15 y^10 ]  * [ 256] * y^4  =

 

(126 * 256 / 32)  [x^15 * y^14 ]

 

1008 x^15 y^14

 

 

cool cool cool

 Jan 16, 2020
 #4
avatar+1690 
+1

This is a bit easier to understand, thank you for your help.smiley

jjennylove  Jan 16, 2020

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