Binomial question help (1 Viewer)

[Elise8842]

Could someone please help me with part two this question? my answer has the sigma sign in it, and I don't quite get what the solution provided in the book
mean

Thanks in advance

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[RenegadeMx]

let me just rotate my head 90 degrees

 

[Elise8842]

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[Elise8842]

Sorry for the neck pain and my unthoughtfulness [emoji26] how's this?


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[aDimitri]

just after i finish reading the whole thing i noticed there is a rotated version...
why is there a sigma in yours? there is no sum?
it's just comparing the term independent of x.
on the LHS the term independent of x is just (p+q)C(q)