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6x^4 + 7x² = 124
ordenando
6x^4 + 7x² - 124 = 0
6x² 31
x² -4
6x² + 31 = 0 ∨ x² - 4 = 0
6x² = - 31 ∨ x² = 4
x = vacio x = +/- 2
nos piden el positivo luego es 2