The quadratic formula, is used to solve for the roots(x-intercepts) of the quadratic equation. 

*Remember that negative roots can not be square rooted*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Now lets try!

 

a) 5x2+3x+4=0                                      b) 3x2-14x-5=0                                                      c) 4x2+20x+6=0

 

 

 

 

 

 

 

d) 3x2+5x=4