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x⁴ + 2x² + 1 - 9x² - 9 + 20 = 0
x⁴ - 7x² + 12 = 0
(x²-3)(x²-4) = 0
x²-3 = 0 x²-4 = 0
las soluciones enteras salen de x² - 4 = 0 ya que las soluciones que salen de x² - 3 = 0 son irracionales.
x² - 4 = 0
(x+2)(x-2) = 0
x - 2 = 0 x + 2 = 0
x = 2 x = -2
POR TANTO
las soluciones enteras son x = 2 o x = -2