3x²+3x+x+1+4x≥3x²+9x+2x+6-6x
3x²+3x+x+1+4x -3x²-9x-2x-6+6x ≥ 0
3x -5≥ 0
3x≥ 5 /: 3
x≥ 5/3 = 1 i 2/3
b) x²+3x+x+3+2x≤x²+2x+3x+6
x²+3x+x+3+2x-x²-2x-3x-6≤0
x-3≤0
x≤3
c)x²+6x+3≤x²+5x+6
x²+6x+3-x²-5x-6≤0
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b)
c)
3x²+3x+x+1+4x≥3x²+9x+2x+6-6x
3x²+3x+x+1+4x -3x²-9x-2x-6+6x ≥ 0
3x -5≥ 0
3x≥ 5 /: 3
x≥ 5/3 = 1 i 2/3
b) x²+3x+x+3+2x≤x²+2x+3x+6
x²+3x+x+3+2x-x²-2x-3x-6≤0
x-3≤0
x≤3
c)x²+6x+3≤x²+5x+6
x²+6x+3-x²-5x-6≤0
x-3≤0
x≤3