a)x-3(x+3) =???
Rozwiąż równanie:
b) x-3/x-7=4x/x+3 ?
c) x/x+1 =2/x+3 ?
a) x^2-3x+3x-9
x^2-9=0
x=3 x=-3
b)(x-3)(x+3)=(x-7)4x
x^2+3x-3x-9=4x^2-28x
-3x^2+28x-9=0
pierwiastek z delty= pierw z 676
x1=-28-pierw z 676/-2
x2=-28+ pierw z 676/-3
c)x(x+3)=2(x+1)
x^2+3x=2x+2
x^2+x-2=0
pierwiastek z delty=3
x1=-1-3/2=-2
x2=-1+3/2=1
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a) x^2-3x+3x-9
x^2-9=0
x=3 x=-3
b)(x-3)(x+3)=(x-7)4x
x^2+3x-3x-9=4x^2-28x
-3x^2+28x-9=0
pierwiastek z delty= pierw z 676
x1=-28-pierw z 676/-2
x2=-28+ pierw z 676/-3
c)x(x+3)=2(x+1)
x^2+3x=2x+2
x^2+x-2=0
pierwiastek z delty=3
x1=-1-3/2=-2
x2=-1+3/2=1