Final answer:
Graphing is the best method for solving quadratic equations when approximate answers are sufficient, as it visually shows where the graph intersects the x-axis. The correct option is D.
Step-by-step explanation:
When approximate answers for quadratic equations are sufficient, the best method to use is D) Graphing. This technique allows you to visually approximate the solutions by finding the points where the graph of the quadratic equation intersects the x-axis.
It might not provide the exact numerical values unless the roots are integers and precisely plotted, but it is quick for getting a general idea of the solutions, especially when precision is not critical. Other methods like factoring, completing the square, or using the quadratic formula generally give exact solutions and might be more complex to apply when only approximate answers are needed.