Quadratic equations may be solved by graphing, using the quadratic formula, completing the square ...

Please post your 100- 125 word (or more) response (as an essay) to the following:

• Quadratic equations may be solved by graphing, using      the quadratic formula, completing the square, and factoring. What are the      pros and cons of each of these methods? When might each method be most      appropriate? Which method do you prefer? Explain why. You may want to      use the table feature to create a neat and organized list of pros and      cons.
• Solve the quadratic x2 – 8x + 15 = 0      using all four methods (for the graphing part, simply describe your graph      here for your classmates, or include as an attachment). Refer back to your      list of pros and cons to describe the method you preferred.

Solve:

0=3x^2+6x+21

0 = 4x^2 + 6x + 4