Oblicz:
a) (2x-1) do kwadratu=(x-4) do kwadratu
b) 2x/2x-3=x+4/x-1
c) x kwadrat + x-2>0
d) -x kwadrat + 4x > lub równe 0
(do dwu ostatnich wykresy paraboli)
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a) (2x-1)^2= (x-4)^2
4x^2-4x+1=x^2-8x+16
3x^2+4x-15=0
delta = 16+180 = 196
pierw z delty = 14
x1=(-4+14)/6=5/3
x2=(-4-14)/6=-3
(x+3)(x-5/3)=0