Find the coefficient for the x² term in the expansion of (x-2)^7
Basically, how would I set it up/solve it?
7C5 * 2^5 = 672 ► (Ans)
In the expansion of (x - 2)^7, 6th term will contain x²
i.e T6 = T(5 + 1) = 7C5 x^(7 - 5) * 2^5 ==> 7C5 x² * 2^5
=> 672 x²
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Verified answer
7C5 * 2^5 = 672 ► (Ans)
In the expansion of (x - 2)^7, 6th term will contain x²
i.e T6 = T(5 + 1) = 7C5 x^(7 - 5) * 2^5 ==> 7C5 x² * 2^5
=> 672 x²