Derive the quadratic formula from the standard form (ax2 + bx + c = 0) of a quadratic equation by following the steps below.

a. divide all terms in the equation by a.
b. subtract the constant (the term without an x) from both sides.
c. add a constant (in terms of a and b) that will complete the square.
d. take the square root of both sides of the equation.
e. solve for x.