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x² - 9x + 8 ≤ 0
(x - 8)(x - 1) ≤ 0
x1 = 8
x2 = 1
x² - 9x + 8 ≤ 0
(1)² - 9(1) + 8 ≤ 0
1 -9 + 0 ≤ 0
0 = 0
Vemos que es igual a cero