Quadratic Equations Part 2:  The Quadratic Formula

1. Solve:  x² + 6x = -8.

 x = {2, 4}

 x = {-4, -2}

 No Solution.

2. Solve:   .

  x = {, 1}

  x = {-3, -2}

  x = No Solution.

3. Solve:  50x² + 250x + 300= 0.

  x = {2, 3}

  x = {20, 30}

  x = No Solution.

4. Solve:  x² - 15x + 66 = 10.

 x = {11,6}

 x = {7, 8}

 No Solution.

5. Solve:  x² - 8x + 2  =   0.

 x =

 x =

 No Solution.

6.   Solve:  x² + 10x - 4   =   0.

 x =

 x =

 No Solution.

7. Solve:  2x² + 8x - 3   =   0.

 x =

 x =

 No Solution.

8. Solve  3x² + 8x = 1.

 x =

 x =

No Solution.

9. The Essex Cookie Company sells the best chocolate fudge cookie known to mankind. The cost, in dollars, per week to produce a pound of these cookies is C(x) = 3x + 25.   The amount of weekly revenue the company receives is R(x) = 12x - 0.3x².  How many pounds of cookies must be sold for ECC to earn $35?

 Either 26 or 9 pounds.

 35 pounds.

20 pounds.