C2 2015 1 Edexcel

1

(2-\frac{x}{4})^{10}=2^{10}+2^{9}\times(-\frac{x}{4})\times\binom{10}{1} + 2^{8}\times(-\frac{x}{4})^{2}\binom{10}{2}
=2^{10}-2^{7}\times x\times10+2^{4}\times x^{2}\times45
=1024-1280x+720x^2

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