C2 2016 5 Edexcel

5

5(a) (2 - 9x)^4
= 16 + (4C1)(8)(-9x) + (4C2)(4)(81x^2)
= 16 - 288x + 1944x^2 -…

(b) A = 16

© 16k - 288 = -232
k = 7/2

(d) B = 1944 + (7/2)(-288) = 936

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