Expand (1+3x) ^4 (1 -2x ) ^ 5 in ascending powers of x
as far as the term in x ^2 .
他在問咩?
咩野做 in ascending powers of x
as far as the term in x ^2?
謝謝
pascal's triangle
2011-04-07 11:57 am
回答 (1)
2011-04-07 5:05 pm
✔ 最佳答案
Ascending power of x means the power of x increases in the expansion, that is x, x^2, x^3, x^4 ....and so on. In this expression, the highest power of x is (x^4)(x^5) = x^9, so you are requested to expand up to x^2 only, x^3, x^4 ... x^9 are not needed. That means the answer will be a + bx + cx^2.
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https://hk.answers.yahoo.com/question/index?qid=20110407000051KK00189