Easy Algebra Step-by-Step

230 Answer Key

8. x^2 − 10x = −25
   x^2 − 10x + 25 = −25 + 25
   (x − 5)^2 = 0
   x = 5


9. −x^2 = −9
   x^2 = 9
   x = ±3
   10. 6x^2 = x + 2
   6 x^2 − x − 2 = 0
   (2x + 1)(3x − 2) = 0
   2 x + 1 = 0 or 3x − 2 = 0

x=−

1

2

or x=

2

3

Chapter 16 The Cartesian Coordinate Plane

Exercise 16

1. 
   

   True

   
   


2. 
   

   False

   
   


3. 
   

   True

   
   


4. 
   

   False

   
   


5. 
   

   True

   
   


6. 
   

   False

   
   


7. 
   

   rise

   
   


8. 
   

   run

   
   


9. 
   

   negative

   
   


10. 
    

    positive

    
    


11. 
    

    zero

    
    


12. 
    

2

3

13. −

4

3

14. undefi ned