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If (1+x)^(n)=C(0)+C(1)+x+C(2)x^(2)+...+C...

If `(1+x)^(n)=C_(0)+C_(1)+x+C_(2)x^(2)+...+C_(n) x^(n)`
Find the value of `C_(1)+2^(2)*C_(2)x+3^(2)*C_(3)x^(2)+...+n^(2)*C_(n)x^(n-1)` and hence find the sum of `C_(1)-2^(2)*C_(2)+3^(2)*C_(3)-.... +(-1)^(n-1)*n^(2)*C_(n)`

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