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 4 s

Question 2

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

Revolt · Accepted Answer

The formula was not simplified correctly.; The 64 should have been added.; The radicand should be 73.; There should be 2 real roots.

Question 3

4y - 7 = 5x2 - x + 2 + 3ynoonetwo real solution(s)

Revolt · Accepted Answer

no

Question 4

y = (-x + 4)2noonetwo real solution(s)

Revolt · Accepted Answer

one

Question 5

Step 1: ax2 + bx + c = 0

Revolt · Accepted Answer

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

Question 6

y = 12x2 - 9x + 4✔ noonetwo real solution(s)

Revolt · Accepted Answer

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

Question 7

Complete the statements.Graph [___] has one real root.

Revolt · Accepted Answer

B; Selection 1: B; Selection 2: A; Selection 3: C

Question 8

ABCD

Revolt · Accepted Answer

B; Selection 1: B; Selection 2: D; Selection 3: A; Selection 4: C

Question 9

Choose the equation that represents the solutions of 0 = 0.25x2 - 8x.

Revolt · Accepted Answer

Answer image: //media.edgenuity.com/EVresources/3111-03-08-20-01-task/mc001-3.jpg

Question 10

Which of the statements about the following quadratic equation is true? 6x2 - 8 = 4x2 + 7x

Revolt · Accepted Answer

The discriminant is greater than zero, so there are two real roots.

The Quadratic Formula Answers

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