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Aplicas diferencia de cuadrados.
a² - b² = (a + b)(a - b)
9x² - 4 = 0
3²x² - 2² =
(3x + 2)(3x - 2) = 0 Tiene 2 soluciones reales
3x + 2 = 0
3x = - 2
x = - 2/3
o
3x - 2 = 0
3x = 2
x = 2/3
Solucion.
(- 2/3 , 2/3)