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x²+x+1=0
Δ=b²-4ac
Δ=1-4
Δ= -3
Δ< 0 ; a zatem to rownanie nie ma pierwiastkow
3x³+9x²=0 /:3
x³+3x²=0
x²(x+3)=0 ⇔ x=0 ∨ x+3=0
x=0 ∨ x= -3
Rozwiazaniem rownania sa liczby : x=0 ; x= -3