Rozwiąż równania: a) x3+ x2- 9x- 9= 0 b) x3- 7x2+ 10x= 0 c) ( x-2 )(x+3) / ( x+1)( x-4)= 0 KRESKA ŁAMANA TO PODZIELIĆ!!!
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a) x³+x²-9x-9=0
x²(x+1)-9(x+1)=O
X=-1
b)x³-7x²₊10x=0
x( x²-7x₊10)=0
Δ=b²-4ac
Δ=49- 4 ×1×10
Δ=9
x₁=-b-√Δ/2a
x₁=-7-3/2
x₁=-5
x₂=-b-√Δ/2a
x₂=-7₊3/2
x₂=-2