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a)
4x²-15x+9≥0
4x²-15x≥-9
4x-15x≥√-9
-11x≥-3
x≤-3/-11
x≤3/11
b)
6x²+7x<13
6x+7x<√13
13x<√13
x<1
c)
-2x²-9x+5≤0
-2x-9x≤-5
-11x≤-5
x≥5/11
d)
3x²>17x-20
3x²-17x>-20
3x-17x>√-20
-14x>√-20
x<√20÷14
e)
5x+14>x²
5x-x²>-14
5x-x>√-14
4x>√-14
x√-14/4
f)
-3x²+4x-1≥0
-3x²+4x≥1
-3x+4x≥√1
x≥1
g)
2x²+x+7<0
2x²+x<-7
2x-x<√-7
x<√-7
h)
-3x²+2x-1≤0
-3x²+2x≤1
-3x+2x≤√1
-1x≤1
x≤-1
Zad.2
a)
½x²-2(x+1)<0
½x²-2x+2<0
½x²-2x<-2
½x-2x<√-2
-1½x<√-2
x> √2 ÷ 1½
b)
2(3x-1)+x(x+3)>8
6x-2+x²+3x>8
x²+9x>10
10x>√10
x>√10÷10
c)
(1-x)²+2x≥4-(x+2)²
1-2x+x²+2x ≥4-x²+4x+4
2x²-4x≥7
2x-4x≥√7
-2x≥√7
x≤√7÷(-2)
d)
(x-3)²≥(2-3x)²-(x-2)(x+2)
x²-6x+3²≥4-12x+3x²-x-4
x²+7x≥0
x+7x≥0
8x≥0
x≥0
e)(x+√3)(x-√3)+2x(1-x)<(x-6)(x+6)
x²+3+2x-2x²<x²-36
-2x²+2x<-39
-2x+2x<√-39
0<√-39