Question

Решить уравнения :
1) -4x²-7x+2=0
2) 7x²+10x+3=0
3) x²+7x+10=0

Answer 1

1) D=49+32+81
x1=-2
x2=0,25

2)D=100-84=16
x1=3,5
x2=1,5

3)D=49-40=9
x1=-2
x2=-5

Answer 2

1.D=49+4*2*4=81
x1=7+9/-8=-2
x2=7-9/-8=0,25
2.D=100-4*7*3=16
x1=-10-4/14=-1
x2=-10+4/14=-6/14=-3/7
3 D=49-40=9
x1=-7+3/2=-2
x2=-7-3/2=-5