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x^2+2x +1+3=6
x^2+2x - 2=0
aplicando la fórmula general tenemos dos raíces:
X1 = -1 + raíz cuadrada de 2
X2 = -1- raíz cuadrada de 2
2) X^2-4 = 3(55)
X^2=165+4
X^2=169
X = + - 13
tiene dos raíces: X1=13 X2= -13
3) X^2+2X+4 + 2 =8-2
X^2 +2X +6=6
X^2 + 2X=6-6
X^2 +2X=0
X(X+2)=0
X=0 o X+2=0
X= - 2
tiene dos raíces: X1=0 X2= - 2