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2x² = 72
x² = 72/2
x² = 36
x = +/- √36 Tiene como solución dos raices reales.
x = √36
x = 6 Porque 6 * 6 = 36
o
x = - √36
x = - 6 Porque (- 6)(- 6) = 36
Solución.
(6 , - 6)