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x² - x - 56 = 0
x² - x = 56
x² = 56 + x
x = √(56 + x)
x ⇒ 8
Reemplazamos para comprobar:
8 = √(56 + 8)
8 = √(64)
8 = 8
(x-8)(x₊7)=0
x₁=8 x₂=₋7