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SEA "X" EL NÚMERO:
LUEGO:
X² - 9 = 315
X² = 315 + 9
X² = 324
X = √324
X = 18
ESO ES TODO, SALUDOS.................
x=numero
x^2-9=315
x^2=315+9
x^2=324
raiz(x^2)=raiz(324)
x=18
x=-18
dos soluciones
saludos