andonantonpolyako424

3 + 20х - 6х - 40 = 0

х(3х+20)-2(3х+20)=0

(3х+20)(х-2)=0

3х+20=0

х-2=0

х₁= -

х₂=2

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Д=14²-4*3*(-40)=676

х=-14±26/6

х=-14+26/6=2

х=-14-26/6=-20/3

Ответ х1=-20/3 , х2=2