2x^2-24x+54=0

3x^2+24x-27=0

1) 2x^2-24x+54=0
x^2-12x+27=0
Виет
x+x'=12
x×x'=27
x=9 x'=3
2) 3x^2+24x-27=0
x^2+8x-9=0
Виет
x+x'=-8
x×x'=-9
x=-9
x'=1