1. 2х2-3х-5=0, 2. х2+х-2=0, 3. -х2+х+9=0, 4. 4х2+6х=10, 5. 3х2-2х+9=0, 6. х2+8х+16=0.

Question

1. 2х2-3х-5=0,

2. х2+х-2=0,

3. -х2+х+9=0,

4. 4х2+6х=10,

5. 3х2-2х+9=0,

6. х2+8х+16=0.

Answer 1

1.Д=9+40=49
х1=3+7/2=10/2=5
х2=3-7/2=-4/2=-2
2.Д=1+8=9
х1=-1+3/2=2/2=1
х2=-1-3/2=-2/2=-1
3.Д=1+36=37