Respuesta :

b^2 - 4ac
(-9)^2 - 4 (2)(9)
= 81 - 72
=9 >0 yet it is a perfect square (3^2 =9)
So , it is 2 real and rational roots

(x-3) ( 2x-3) =0
x = 3 , x = 3/2

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