rozwiaz rownania kwadratowe:
a) (x-1)^2 +2(x-1)
b) -x^2 +4x = 3
c) -3x^2 - 5x = -2
Z grór Bog zapłac :D
a) (x-1)² +2(x-1)=x²-2x+1+2x-2=x²-1
x²-1=0
x²=1
x=1 lub x=-1
b) -x² +4x = 3
-x²+4x-3=0
Δ=16-4*(-1)*(-3)
Δ=16-12
Δ=4
√Δ=2
x1=(-4-2)/-2=-6/-2=3
x2=(-4+2)/-2=-2/-2=1
c) -3x² - 5x = -2
-3x²-5x+2=0
Δ=25-4*(-3)*2
Δ=25+24
Δ=49
√Δ=7
x1=(5-7)/-6=-2/-6=1/3
x2=(5+7)/-6=12/-6=-2
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a) (x-1)² +2(x-1)=x²-2x+1+2x-2=x²-1
x²-1=0
x²=1
x=1 lub x=-1
b) -x² +4x = 3
-x²+4x-3=0
Δ=16-4*(-1)*(-3)
Δ=16-12
Δ=4
√Δ=2
x1=(-4-2)/-2=-6/-2=3
x2=(-4+2)/-2=-2/-2=1
c) -3x² - 5x = -2
-3x²-5x+2=0
Δ=25-4*(-3)*2
Δ=25+24
Δ=49
√Δ=7
x1=(5-7)/-6=-2/-6=1/3
x2=(5+7)/-6=12/-6=-2