<span>y=x²-3.
1) x=5
y = 5</span>²-3
<span>y=22
2) x=-4
y=(-4)</span>²-3
<span>y = 13
3) x=0,1
y = 0,01-3
y=-2,99
4)x=0
y = -3</span>
<span>3x^{2}+2x-1< 0
D = 4+ 4*3*1 = 16
x1 = (-2-4)/6 = - 1
x2 = (-2+4)/6 = 1/3
+ - +
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-1 1/3
x</span>∈(-1;1/3)
-a-5b=20
-a=20+5b -5b=20+a
a=5b-20 b=a/5-4
-5 < 4 - 3x <= 2
-5-4 < 4-4 - 3x <= 2-4
-9 < -3x <= -2
3 > x >= (2/3)
(2/3) <= x < 3