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616. x² − 6x + 8 = 0

6²-4×8=4

x₁=-b+√D/2a=6+2/2=4

x₂=-b-√D/2a=6-2/2=2

x²+5x+6=0

D=b²-4ac

25-24=1

x₁=-5+1/2=-2

x₂=-5-1/2=-3

x² − x − 2 = 0

D=b²-4ac

-1²+8=9

x₁=1+3/2=2

x₂=(1-3)/2=-1

x² + x − 6 = 0

D=b²-4ac

1+24=25

x₁=-1+5/2=2

x₂=-1-5/2=-3

x² + 4x + 15 = 0

D=b²-4ac

16-60=-44

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x² + 4x + 4 = 0

D=b²-4ac

16-16=0

x=-4+0/2=-2

5x² + 8x − 9 = 0

D=b²-4ac

64+180=244

x₁=-8+√244/10

x₂=-8-√244/10

4x² − 8x + 3 = 0

D=b²-4ac

64-48=16

x₁=8+4/8=1 1/2

x₂=8-4/8=0.5

3x² − 5x − 2 = 0

D=b²-4ac

25+24=49

x₁=5+7/6=2

x₂=(5-7)/6=-2/6=-1/3

5x² − 6x + 1 = 0

D=b²-4ac

36-20=16

x₁=6+4/10=1

x₂=6-4/10=0.2

617. x²-1/2x-1/2=0

2x²-x-1=0

D=b²-4ac

1+8=9

x₁=1+3/4=1

x₂=(1-3)/4=-0.5

x²-3/4x+1/8=0

8x²-6x+1=0

D=b²-4ac

36-32=4

x₁=6+2/16=1/2

x₂=6-2/16=1/4

x²-8-x/3=0

3x²-24-x=0

D=b²-4ac

576+12=588

x₁=24+√588/6

x₂=24-√588/6

x²+x/7-50=0

7x²+x-350=0

D=b²-4ac

1+9800=9801

x₁=-1+99/14=7

x₂=-1-99/14=7 2/14

x² − 2,5x + 1 = 0

2x²-5+2=0

D=b²-4ac

25-16=9

x₁=-25+3/4=-5.5

x₂=-25-3/4=-7

x²-5 1/5x+1=0

5x²-26+1=0

D=b²-4ac

676-20=656

x₁=-676+25/10=-70.1

x₂=676-25/10=-65.1

618. 2x² = 5 + 3x

2x²-3x-5=0

D=b²-4ac

9+40=49

x₁=-25+7/4=-4.5

x₂=-25-7/4=-8

−x² + 14x − 48 = 0

D=b²-4ac

196+192=388

x₁=-14+√388/-2

x₂=-14-√388/-2

−7x² + 2x = −329

-7x²+2x+329=0

D=b²-4ac

4+9212=9216

x₁=-2+96/-14=-6 10/14=-6 5/7

x₂=-2-96/-14=7

x² + x − 5 = 0

D=b²-4ac

1+20=21

x₁=-1+√21/-2

x₂=-1-√21/-2

2x² − 17x − 9 = 0

D=b²-4ac

289+72=361

x₁=-17+19/4=0.5

x₂=-17-19/4=-9

7x² + 13x − 3 = 0

D=b²-4ac

169+84=253

x₁=-13+√253/14=18 1/14

x₂=-13-√253/14=-18 1/14

9x² − 20 = 24x

9x²-24x-20=0

D=b²-4ac

576+720=1296

x₁=20+36/18=3 2/18=3 1/9

x₂=20-36/18=-3 2/18=-3 1/9

4x² − 4x = 15

4x²-4x-15=0

D=b²-4ac

16+240=256

x₁=4+16/8=2 4/8=2 1/2

x₂=4-16/8=-1 4/8=-1 1/2

621. x² + 6x + 8 = 0

D=b²-4ac

36-32=4

x₁=-6+2/2=-2

x₂=-6-2/2=-4

x² − 10x + 9 = 0

D=b²-4ac

100-36=64

x₁=10+8/2=9

x₂=10-8/2=1

x² − 3x = 1,75

x²-3x-1.75=0

D=b²-4ac

9+7=16

x₁=3+4/2=3.5

x₂=3-4/2=-0.5

x² + x = 2

x²+x-2=0

D=b²-4ac

1+8=9

x₁=-1+3/2=1

x₂=-1-3/2=-2

x² − 6x + 6 = 0

D=b²-4ac

36-24=12

x₁=6+√12/2

x₂=6-√12/2

x² + 8x + 2 = 0

D=b2-4ac

64-8=56

x₁=-8+√56/2

x₂=-8-√56/2

x² − 3x + 1 = 0

D=b²-4ac

9-4=5

x₁=3+√5/2

x₂=3-√5/2

x² − 5x − 1 = 0

D=b²-4ac

25+4=29

x₁=5+√29/2

x₂=5-√29/2

x² + 8x + 15 = 0

D=b²-4ac

64-60=4

x₁=-8+2/2=-3

x₂=-8-2/2=-5