completing the square??

hi! i really need some help.

my teacher was walking me through these problems, but she had to leave. and they are due today, so i need to get them done. could someone walk me through them please? thanks SOOOO much!!!! <33

11: 12x2 + 11x + 2 = 0

{3/2, -2}

{ -1/4, -2/3 }

{1/2, -1/6}

{ 10 , -1 }

12: x2 - 4x - 3 = 0

3 ±√7

3 ±√5

2 ±√5

2 ±√7

13: -3x2 + 8x = -4x2 + 12

-4 ± 2 √7

4 ± 2 √7

4 ± 2 √6

-4 ± 2 √6

14: Solve by using the quadratic formula.

3x2 - x - 2 = 0

{ 1 , 6/5}

{1/2, -1/6}

{ 1 , -2/3}

{3/2, -2}

15: -6x2 - 9x + 5 = 0

-7 ±√201

--------------------------------------------------------------------------------

12

-9 ±√201

--------------------------------------------------------------------------------

12

-7 ±√200

--------------------------------------------------------------------------------

12

-9 ±√200

--------------------------------------------------------------------------------

12

16: -x2 = 3x - 2

3 ±√19

--------------------------------------------------------------------------------

-2

-3 ±√19

--------------------------------------------------------------------------------

2

-3 ±√17

--------------------------------------------------------------------------------

-2

-3 ±√17

--------------------------------------------------------------------------------

2

17: -x2 - 10x + 7 = 0

-5 ± -4 √2

5 ± 4 √2

5 ± -4 √1

-5 ± 4 √1

18: 10x2 - x - 3 = 0

{1/2, -1/6}

{3/5, -1/2}

{ 10 , -1 }

{1/2, 3/5}

19: -8x2 + x - 16 = -10x2 - 10

{1/2, 2/5}

{1 , 1/2}

{1, 6/5}

{3/2, -2}

20: -x2 + 5x = 2

-5 ±√15

--------------------------------------------------------------------------------

2

-5 ±√15

--------------------------------------------------------------------------------

-2

5 ±√17

--------------------------------------------------------------------------------

2

-5 ±√17

--------------------------------------------------------------------------------

2