Question 457781
You can do it 2 ways.
The discriminant = {{{b^2 - 4ac = 18^2 - 4*81 = 0}}}
--> 2 real solutions, both x = 9
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Or you can factor it
= (x-9)^2
same thing, 2 real solutions x = 9, or x = 9, multiplicity 2.