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2) x²+4=5----> x²=1 √x²=√1 = x=1
3) x²-7=x+3-----> x²-x=3+7-----x²-x-10=0 Resolvemos la cuadrática
x=3.70156 x=-2.70156
4)x+1=x-3-----> x-x=-3-1 0=-4 (No tiene solución)