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单词 BinomialProofOfPositiveIntegerPowerRule
释义

binomial proof of positive integer power rule


We will use the difference quotient in this proof of the power ruleMathworldPlanetmathPlanetmath for positive integers. Let f(x)=xn for some integer n0. Then we have

f(x)=limh0(x+h)n-xnh.

We can use the binomial theoremMathworldPlanetmath to expand the numerator

f(x)=limh0C0nx0hn+C1nx1hn-1++Cn-1nxn-1h1+Cnnxnh0-xnh

where Ckn=n!k!(n-k)!. We can now simplify the above

f(x)=limh0hn+nxhn-1++nxn-1h+xn-xnh
=limh0(hn-1+nxhn-2++nxn-1)
=nxn-1
=nxn-1.
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更新时间:2025/5/4 17:42:24