х⁴-9х+20=0
D=(-9)^2-4(20)=81-80=1
x1,2=-b+-√D\2a
x1=9-1\2=4; ±2
x2=9+1\2 = 5 ; ±√5
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х⁴-9х+20=0
D=(-9)^2-4(20)=81-80=1
x1,2=-b+-√D\2a
x1=9-1\2=4; ±2
x2=9+1\2 = 5 ; ±√5