i) Find the coeficient of 1/x⁵ in the expansion of (2x + 1/x)⁷ ii) Find the term which is independant of x in the expansion of (x² - 1/x)⁹ im in grade 11 and have an exam in 3 days. I tried to do them but get stuck or get a totally wrong answer!
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Hi Originally Posted by milan i) Find the coeficient of 1/x⁵ in the expansion of (2x + 1/x)⁷ Let's expand using Newton's binomial theorem :
The coefficient of is for such that
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