Rozwiąż równania :
a) -3x²-3x+6 = 0
b) x² = -2x
c) x³+2x²-5x-10 = 0
d) x²+1÷x-1 = 2÷x-1
Dam punkty tylko za wsztstkie podpunkty rorwiązane krok po kroku i z takim znakami jak ja pisze !
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a) -3x²-3x+6 = 0
Δ= 9 + 72
√Δ= 9
x₁ = (3-9)÷-6=-6÷-6=1
x₂= (3+9)÷-6=12÷-6=-2
b) x² = -2x
x²+2x=0
x(x+2)=0
x = 0 ∨ x+2=0 x=-2
c) x³+2x²-5x-10 = 0
x²(x+2)-5(x+2) = 0
(x²-5)(x+2)=0
x²-5=0
x=√5 ∨ x=-√5
x+2=0
x=-2
d) x²+1÷x-1 = 2÷x-1
x²+1=2
x²=1
x=1 ∨ x=-1