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Binomial expansion

Find the first 4 terms in ascending power of x of the binomial expansion (1-ax)^10 where a is a non zero constant.
Given that, the coefficient of x^3 is double of the coefficient of X^2, what is the value of a?
ImageUploadedByStudent Room1399523657.754732.jpg hope this makes sense


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mahdinur
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Original post by roisinlacy
ImageUploadedByStudent Room1399523657.754732.jpg hope this makes sense


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Yes.
Very much appreciated.
I did the same but dubted my work.
Anyways thanks

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