Quadratic Equations

 

Quadratic Formula:

x =
      2a

Solve by factoring (if possible) or by the quadratic formula.

  1. x2 = 8x

  2. x2+5x-14 = 0

  3. x2-24 = 5x

  4. 6x2-7x-5 = 0

  5. 12x2-x-6 = 0

  6. x(x-7) = -10

  7. 5x2+6x-10 = 0

  8. x2-2x-8 = 0

  9. 9x2-25 = 0

  10. 2x2+12x = -18

  11. 2x2+9x+3 = 0

  12. (x+4)(x-2) = 7

Answers: 1. {0,8}    2. {-7,2}    3. {8,-3}    4. {-1/2, 5/3}    5. {-2/3, 3/4}    6. {2,5}

7. {-3/5 /5} 8. {4,-2} 9. {-5/3, 5/3} 10. {-3} 11. {-9/4 /4} 12. {-5,3}