WAEC - Further Mathematics (2017 - No. 9)
Find the coefficient of \(x^{4}\) in the expansion of \((1-2x)^{6}\).
-320
-240
240
320
คำอธิบาย
\(^{6}C_{4}(1)^{6-4}(-2x)^{4}\) = \(15\times1\times16x^{4} = 240x^{4}\)
The coefficient of \(x^{4}\)= 240
\(^{6}C_{4}(1)^{6-4}(-2x)^{4}\) = \(15\times1\times16x^{4} = 240x^{4}\)
The coefficient of \(x^{4}\)= 240