The Quadratic Formula

Question 1

The height h (in feet) of an object t seconds after it is dropped can be modeled by the quadratic equation h = -16t2 + h0, where h0 is the initial height of the object. Suppose a small rock dislodges from a ledge that is 255 ft above a canyon floor. Solve the equation h = -16t2 + 255 for t, using the quadratic formula to determine the time it takes the rock to reach the canyon floor.

Revolt · Accepted Answer

t 0.87 s

Question 2

Which of the following did you include in your response? Check all of the boxes that apply.

Revolt · Accepted Answer

The 64 should have been added.

Question 3

Graph AB✔ C has an equation with coefficientsa = 1, b = 4, c = -2

Revolt · Accepted Answer

✔ C

Question 4

AB✔ CD

Revolt · Accepted Answer

✔ C

Question 5

Question 5

Revolt · Accepted Answer

real solution(s): no; real solution(s): two; real solution(s): one

Question 6

Complete the statements.Graph A✔ BC has one real root.

Revolt · Accepted Answer

✔ B; has one real root.: B; has a negative discriminant.: A; has an equation with coefficients: C

Question 7

Step 1: ax2 + bx + c = 0

Revolt · Accepted Answer

✔ B; Step 3:: A; Step 5:: A; Step 6:: A; Step 8:: C

Question 8

Graph ✔ ABC has a negative discriminant.

Revolt · Accepted Answer

✔ A

Question 9

ABC✔ D

Revolt · Accepted Answer

✔ D

Question 10

AB✔ CD

Revolt · Accepted Answer

✔ C

The Quadratic Formula Answers

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