Równania kwadratowe
1.Rozwiąż równanie.
a) 4x^{2}-13x+3=0
b) 5x^{2}-6x+6=0
2.Rozwiąż równanie.
a) 2x^{2}+3=-7x
b) x+10=3x^{2}
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a) 4x^{2}-13x+3=0
Δ=13²-4*4*3=121
√Δ=11
x1=(13-11)/8=1/4
x2=(13+11)/8=3
b) 5x^{2}-6x+6=0
Δ=36-4*5*6=-84
Δ<0 - brak rozwiązań
a) 2x^{2}+3=-7x
2x²+7x+3=0
Δ=7²-4*2*3=25
√Δ=5
x1=(-7-5)/4=-3
x2=(-7+5)/4=-1/2
b) x+10=3x^{2}
3x²-x-10=0
Δ=1-4*3*(-10)=121
√Δ=11
x1=(1-11)/6=-10/6=-1i2/3
x2=(1+11)/6=2