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7-28.

Use the Quadratic Formula to solve part (b) of problem 7-27. Did your solution match the solution you got in part (b) of problem 7-27? Which solution method do you prefer?

Example 2: Solve  for  using the Quadratic Formula. 
Solution: This method works for any quadratic. First, identify  equals the number of  terms,  equals the number of  terms, and  equals the constant. For . Substitute the values of  into the Quadratic Formula and evaluate the expression twice: once with addition and once with subtraction. Examine this method below:

or