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2x^2 = 17 + 1
2x^2 = 18
x^2 = 18 / 2
x^2 = 9
x = +/-√9
x1 = 3 ; x2 = -3
sumamos 1 a cada lado
2x² = 18
dividimos entre dos cada lado:
x² = 9
finalmente sacamos raíz:
x = 3
x = -3
esas son las soluciones