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[tex]\displaystyle\bf\\1)\\\\(2+t)^{2} -4=0\\\\(2+t)^{2} =4\\\\\\\left[\begin{array}{ccc}2+t=-2\\2+t=2\end{array}\right\\\\\\\left[\begin{array}{ccc}t_{1} =-4\\t_{2} =0\end{array}\right\\\\\\Otvet \ : \ -4 \ ; \ 0\\\\\\2)\\\\-(x-0,2)^{2} =0,09\\\\(x-0,2)^{2} =-0,09[/tex]

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