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[tex]x^{2} -3x+2=0x^{2} +6x-7=05x^{2} +15x+102=0[/tex]
[tex]x^{2} -3x+2=0x^{2} +6x-7=05x^{2} +15x+102=0[/tex]
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x²-3x+2=0
D= 3*3-4*2= 9-8=1
x1= (3+1)/2= 2
x2= (3-1)/2= 1
x²+6x-7=0
D= 6*6+4*7= 36+28=64
x1= (-6+8)/2= 1
x2= (-6-8)/2= -7
5x²+15x+102=0
D= 15*15-4*5*102= 225-2040= -1815
D<0, действительных корней нет