Quadratic Equations  Exercise 6  Deriving The Quadratic Formula
Find a general solution for ax^{2} + bx + c = 0 by applying
the method used to complete the square in Exercise 5. Justify each
reason. No books allowed, but you may refer to Exercise 5.
STATEMENT 
JUSTIFICATION 
ax^{2} + bx + c = 0

GIVEN 
