Respuesta :
Answer:
-3,-2,3,2
Step-by-step explanation:
Let a = x^2
Then the equation turns into
a^2 - 13 a + 36 =0
a^2 - 4a - 9a + 36 = 0
a(a - 4) -9 (a -4) =0
(a-9)(a-4) = 0
a = 9 or a = 4
So
x^2 = 9 or x^2 = 4
Therefore x = -3,3 or x= -2,2.
x⁴ - 13x² + 36 = 0
t² - 13t + 36 = 0
t = 4, t = 9
x² = 4, x² = 9
x = ±2, x = ±3
