Lesson 321 of 1524
9.7 Applying the Quadratic Formula
The correct answers are 2 and 8: - ( - 5 ) + 9 = 5 + 3 = 8 and - ( - 5 ) - 9 = 5 - 3 = 2
Practice this chapterThe correct answers are 2 and 8: - ( - 5 ) + 9 = 5 + 3 = 8 and - ( - 5 ) - 9 = 5 - 3 = 2 With each one, you identified the error that occurred and explained why it was an incorrect step
Evaluate each expression for a = 9 , b = - 5 , and c = - 2
correct answers — 2 and 8: - ( - 5 ) + 9 = 5 + 3 = 8 and - ( - 5 ) - 9 = 5 - 3 = 2.
Be able to identify common errors when using the quadratic formula; describe some ways to tell if a number is a solution to a quadratic equation.
Worked example
What does “correct answers” mean in 9.7 Applying the Quadratic Formula?
- 1Use the wording this chapter gives for correct answers.
- 2The book says: 2 and 8: - ( - 5 ) + 9 = 5 + 3 = 8 and - ( - 5 ) - 9 = 5 - 3 = 2.
- 3Keep the answer tied to this term.
Result: 2 and 8: - ( - 5 ) + 9 = 5 + 3 = 8 and - ( - 5 ) - 9 = 5 - 3 = 2
Why. That is the meaning this chapter gives for correct answers.
Answer with the meaning this chapter gives. A nearby idea from the same book is a different term.
Practice margin
This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.