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(x+3)(x-3)=216
x²-9=216
x²=216+9
x²=225
√x²=√225
x=15 x= -15
si te valen los numero negativos,las soluciones son 15 y -15
si solo te valen los numeros positivos,la solucion es 15
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(x+3)(x-3)=216
18(12)=216
216=216