Объяснение:
7) D=4²+4*3*7=16+84=100=10²
x1=(4+10)/6=14/6
x2=(4-10)/6=-1
(-1; 14/6)
8) 3x+9-x+2>=0 2x>=-11 x<=-5,5
2x-6x+18<=x-5 -5x<=-23 x>=4,6
(-inf; -5,5] + [4,6; +inf)
9)
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Объяснение:
7) D=4²+4*3*7=16+84=100=10²
x1=(4+10)/6=14/6
x2=(4-10)/6=-1
(-1; 14/6)
8) 3x+9-x+2>=0 2x>=-11 x<=-5,5
2x-6x+18<=x-5 -5x<=-23 x>=4,6
(-inf; -5,5] + [4,6; +inf)
9)