oblicz rownania
.x2=256
x2-8x=0
x2+4=0
oblicz nierownosci
3x2-2x1 wieksze badz rowne od 0
3x+2x+1 wieksze badz rowne od 0
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a)
x^2 = 256
x^2 - 256 = 0
(x+16)(x-16) = 0
x+16 = 0
x = -16 lub
x-16 = 0
x = 16
x = -16, v x = 16
b)
x^2 - 8x = 0
x(x-8) = 0
x = 0 lub
x-8 = 0
x = 8
x = 0, v x = 8
c)
x^2 + 4 = 0
równanie sprzeczne (L = x^2 + 4 > 0).
d)
3x^2 - 2x >= 0
x(3x-2) = 0
x = 0 lub
3x = 2 /:3
x = 2/3
a > 0,ramiona paraboli skierowane w górę,
xe (-oo; 0 > i < 2/3; +oo)
e)
3x+2x+1 >= 0
5x +1 >= 0
5x >= -1 /:5
x >= -1/5
proszę załacznik