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2x² - 8 = 0 Simplificas sacas mitad
2x²/2 - 8/2 =
x² - 4 = 0 Factorizas. Caso diferencia de cuadrados
Aplicas a² - b² = (a + b)(a - b)
x² - 2² = 0
(x + 2)(x - 2) = 0 Tiene como solución dos raices reales distintas
x + 2 = 0
x = - 2
o
x - 2 = 0
x = 2
Solución
( 2 , - 2)