1.rozwiaz nierownosc
a)x2-x-6wieksze badz rowne 0
b)-1/2x2 +3x +8 wieksze badz rowne 0
c)-2x2+6x-9/2<0
2.
a)pierwiastek2x2+6x mniejsze badz rowne 0
b) 9-1/4x2 wieksze badz rowne 0
c)-x2-12>0
3.
a)(2x-2)(x-3)<(x-3)(x-4)
b)(3x-1)(x+2) wieksze badz rowne(x-3)(2x-1)
c)(2x-2)2woeksze badz rowne(3x-2)(x-3)
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odpowiedzi w załączniku
a)x2-x-6 >= 0
delta=1+4*6=1+24=25
pierw z delty= 5
x1=(1-5)/2= -4/2=-2
x2=(1+5)/2=6/2=3
x nalezy (-niesk; -2>U <3;+niesk)
b)-1/2x2 +3x +8 >=0
delta= 9 - 4*8*-1/2= 9+16=25
pierw z delty=5
x1=(-3-5)/-1= -8/-1=8
x2(-3+5)/-1=2/-1=-2
x nalezy <-2;8>
c)-2x2+6x-9/2<0
delta=36 - 4*2*9/2= 36-36=0
x0 = -b/2a= -6/-4=1,5
x nalezy R - {1,5}
2.
a)pierwiastek2x2+6x<= 0
x(pier z2x+6)<=0
x=0 v pier z 2 x=-6
x= -3 pier z 2
x nalezy <-3pier z 2; 0>
b) 9-1/4x2 >= 0
(3-1/2x)(3+1/2x) >= 0
-1/2x=-3 v 1/2x=- 3
x=6 v x =-6
x nalezy <-6;6>
c)-x2-12>0
-x^ > 12
x^ < -12
x nalezy zbior pusty
3.
a)(2x-2)(x-3)<(x-3)(x-4)
2x^-6x-2x+6<x^-4x-3x+12
x^-x-6<0
delta = 1+4*6=25
pier z delty= 5
x1=(1-5)/2= -4/2=-2
x2=(1+5)/2= 6/2=3
x nalezy (-2;3)
b)(3x-1)(x+2) >=(x-3)(2x-1)
3x^ +6x-x-2>= 2x^ -x -6x+3
x^ +12x -5 >= 0
delta = 144 +20 = 164
pier z delty = 2 pier z 41
x1=(-12 -2 pier z 41)/2= -6 - pier z 41
x2=(-12+2 pier z 41)/2 = -6+ pier z 41
x nalezy (-niesk; -6- pier z 41> U < -6+ pier z 41 ; +niesk)
c)(2x-2)2 >=(3x-2)(x-3)
4x^-8x +4 >= 3x^-9x -2x +6
x^ +3x -2>=0
delta = 9+8= 17
pier z delty = pier z 17
x1=(-3 - pier z 17)/2
x2=(-3+ pier z 17)/2
x nalezy < (-3 - pier z 17)/2; (-3 +pier z 17)/2>