Solve each quadratic equation. show your work. 14. (2x – 1)(x + 7) = 0 15. x2 + 3x = 10 16. 4x2 = 100

14.  (2x - 1)(x + 7) = 0

Using the zero factor property, we know that either the first or second terms (or both) must be equal to 0 if their product is 0.  We can set each term equal to 0 to find the solutions:

2x - 1 = 0
2x = 1
x = 1/2

x + 7 = 0
x = -7

15.  

To solve this equation, you first need to set it equal to 0:



Next, it can be factored:



Finally, we can solve just like we did above:

x + 5 = 0
x = -5

x - 2 = 0
x = 2

16.  

First, you can simplify by dividing each side by 4:



Now, set the equation equal to 0:



Next, factor:



Finally, find the solutions:

x + 5 = 0
x = -5

x - 5 = 0
x = 5