х2 + 7х - 10 = 0
- х2 + 7х + 8 = 0
- х2 - 2х + 15 = 0
5х2 - 8х - 4 = 0
6х2 - 7х + 1 = 0
5х2 - 8х + 3 = 0
7х2 + 9х + 2 = 0
2х2 - 9х + 4 = 0
1/9 х2 - х + 2 = 0
1/4 х2 + 2 х + 3 = 0
1/12 х2 - 1/3 х + 1 = 0
7х2 - 8х + 1 = 0
3х2 + 8х - 3 = 0
3х2 - 7х + 2 = 0​

Объяснение:

. x^2-7x+10=0

D= 49-40=9

x1=(7+3)/2=5

x2=(7-3)/2=2

2. x^2-x=0

x(x-1)=0

x1=0 x2=1

3. 2x^2-8x-10=0

D=64+80=144

x1=(8+12)/4=5

x2=(8-12)/4=-1

4. x^2-8x=0

x(x-8)=0

x1=0 x2=8

5. 2x^2-12x-14=0

x^2-6x-7=0

D=36+28=64

x1=(6+8)/2=7

х2=(6-8)/2=-1

6. -х^2+6х+16=0

х^2-6х-16=0

D=36+64=100

x1=(6+10)/2=8

x2=(6-10)/2=-2

7. 3x^2-24x-60=0

x^2-8x-20=0

D=64+80=144

x1=(8+12)/2=10

x2=(8-12)/2=-2

8. x^2-8x-9=0

D=64+36=100

x1=(8+10)/2=9

x2=(8-10)/2=-1

9.-x^2+7x+8=0

x^2-7x-8=0

D=49+32=81

x1=(7+9)/2=8

x2=(7-9)/2=-1