x(x-9)=0
x1=0 x-9=0
x2=9
х ^2 -9х = 0
х(х-9)=0
D =-9^2-4*1* 0=81
x1=0
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Verified answer
x(x-9)=0
x1=0 x-9=0
x2=9
Verified answer
х ^2 -9х = 0
х(х-9)=0
D =-9^2-4*1* 0=81
x1=0
x2=9