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1 0-x²+2
-x²=-2 x²=2 x=√2
2 1-x²+2
-x²+3=0 x²=3 x=√3
3 -1-x²+2
x²=-1 inderterminacion
4 2-x²+2
-x²+4=0 -x²=-4 x²=4 x=√4=2
5 -2-x²+2
-x²+0=0
x²=0 x=0