0
Anonymous
18x= 198
18x/18 = 198/18
x = 11
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It is 2x2 - 7x + 9
x = -4/3
11x = 20x +1811x-20x=18x(11-20)=18-9x=18x=-2
2x2+18x = 20 2x2+18x-20 = 0 x2+9x-10 = 0 (x+10)(x-1) = 0 x = -10 or x = 1
The discriminant is 0.