Распишите пожалуйста
1) x^+4х+4=0
2) х^-2х+8=0
3) х^-5х+4=0
4) х^-7х-19=0
1) 1/2-3/4=
2) 4/8-3/7=
1) x^+4х+4=0
2) х^-2х+8=0
3) х^-5х+4=0
4) х^-7х-19=0
1) 1/2-3/4=
2) 4/8-3/7=
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Answers & Comments
1.D=16-4*1*4=0 x=-4/2=-2
2.D=4-4*8*1=-28 корней нет
3.D=25-4*1*4=9 x1=(5+3)/2=4 x2=(5-3)/2=1
4.D=49-4*1*(-19)=125 x1=(7+15)/2=11 x2=(7-15)/2=-4
1.1/2-3/4=2/4-3/4=-1/4
2.4/8-3/7=28/56-24/56=4/56=1/14