2)lx^2+lx+1ll=x^2

=>x^2+lx+1l=x^2=>lx+1l=0=>x=-1

3)\(\frac{\left(-\frac{1}{2}\right)^n}{\left(-\frac{1}{2}\right)^{n-2}}=\left(-\frac{1}{2}\right)^{n-n-2}=\left(-\frac{1}{2}\right)^{-2}=4\)

Do as directed in brackets.

People will decorate their houses to welcome New Year. (Change into passive)

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