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Solve the following by completing the square.

 

1.  x2 – 6x – 4 = 0                                                

answer: x = sqrt13 + 3, x = -sqrt13 + 3                        

 

 2.  x2 + 7x + 4 = 0

answer: x =  (sqrt33  - 7)/2, x = (-sqrt33 -7)/2

 

 

Solving the following using the Quadratic Formula.

 

3.   3x2 + 5x – 12 = 0                                             

Answer: x = 4/3, -3                          

                                       

4.  5x2 + 7x = 2  

Answer: x = (-7 + sqrt89)/10, x = (-7 – sqrt89)/10

 Mar 25, 2019
 #1
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www.wolframalpha.com

is a good site for you to check these (and many other questions) for yourself.

 

I already added the first one for you :)

https://www.wolframalpha.com/input/?i=x%5E2+%E2%80%93+6x+%E2%80%93+4+%3D+0

 

 

If you have any questions about using it or about any errors you may have made then just ask again on this thread. :)

 Mar 25, 2019

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