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x²=28 + 8
x²=36
√36=x
6=x
x² - 8 = 28
x² = 28 + 8
x² = 36
x = √36 36 = 6 * 6 = 6²
x =√6² Tiene 2 soluciones reales
x = 6 Porque 6 * 6 = 36
o
x = - √6²
x = - 6 Porque (-6)(-6) = 36
Solucion.
(6 , - 6)