Respuesta :

Answer:

Step-by-step explanation:

the discriminant =0

disc.={-2(a-1)}²-4(2a-5)*3

=4(a²-2a+1)-4(6a-15)

=4(a²-2a-6a+1+15)

=4(a²-8a+16)

=4(a-4)²

for a=4,disc=0

so for a=4 ,it has only one real root.

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