Q18 of 25 Page 8

Prove that (x2 – yx)12, x ¹ 0


Tr + 1 in (x2 -yx)12 = 12Cr (x2)12 - r (-yx)r
                         = 12Cr x24 – 2r (-1)r(y)r(x)r
                         = 12Cr x24 – r yr(-1)r

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