Rozwiąż:
a) 2+ -
b) (x-2)(x+1) =0
c) - x +8=0
d) - x +
= 0
e) -3(x-2)(x+1)
f) -x -6 >0
g) -4 +5x-1
0
h) +3x+10>0
i) 3 0
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a) |*2
![4+2x^2-12x+18\leq 2x^2-5x+15\\ -7x\leq-7 |:(-7)\\ x \geq 1 4+2x^2-12x+18\leq 2x^2-5x+15\\ -7x\leq-7 |:(-7)\\ x \geq 1](https://tex.z-dn.net/?f=4%2B2x%5E2-12x%2B18%5Cleq+2x%5E2-5x%2B15%5C%5C+-7x%5Cleq-7+%7C%3A%28-7%29%5C%5C+x+%5Cgeq+1)
![(x-\frac{1}2)^2=0 (x-\frac{1}2)^2=0](https://tex.z-dn.net/?f=%28x-%5Cfrac%7B1%7D2%29%5E2%3D0)
![x-\frac{1}2=0 x-\frac{1}2=0](https://tex.z-dn.net/?f=x-%5Cfrac%7B1%7D2%3D0)
![x=\frac{1}2 x=\frac{1}2](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B1%7D2)
b) (x-2)(x+1) =0
x-2=0 v x+1=0
x=2 v x= -1
c) - x +8=0
delta=1-32 = -31 sprzeczne
d) - x + = 0
e) -3(x-2)(x+1) | :-3
f) -x -6 >0
delta=1+24=25
g) -4 +5x-1 0
delta=25-16=9
h) +3x+10>0
delta=9-40=-31 sprzeczne
i) 3 0