Solving Quadratic Equations: Quadratic Formula

Question 1

Determine which functions have two real number zeros by calculating the discriminant, b2 – 4ac. Check all that apply.

Revolt · Accepted Answer

f(x) = x2 + 6x + 8; h(x) = x2 – 12x + 32; k(x) = x2 + 4x – 1; t(x) = x2 – 2x – 15

Question 2

Question 4

Revolt · Accepted Answer

–3

Question 3

Question 5

Revolt · Accepted Answer

0

Question 4

Haley substituted the values of a, b, and c into the quadratic formula below. x = What was Haley’s function in standard form? f(x) = x2 + x +

Revolt · Accepted Answer

Part 1: 7; Part 2: -10; Part 3: -2

Question 5

What are the values of x in the equation 4x2 + 4x – 3 = 0?

Revolt · Accepted Answer

x = –1.5, 0.5

Question 6

What is true about Marcus’s work? Check all that apply.

Revolt · Accepted Answer

Marcus should have substituted –10 for b, not 10.; Marcus should have subtracted 4(1)(25) in the square root.; This equation, when solved correctly, only has 1 real number solution.

Question 7

Where does f(x) = 3x2 – 11x – 4 intersect the x-axis? The negative x-intercept is at ( , 0). The positive x-intercept is at ( , 0).

Revolt · Accepted Answer

Part 1: -1/3; Part 2: 4

Question 8

Use the drop-down menus to complete the statements about the function p(x) = x(x – 1) + 1. The value of a is . The value of b is . The value of c is . The value of the discriminant is . The quadratic function will intersect the x-axis times.

Revolt · Accepted Answer

1; Selection 1: 1; Selection 2: –1; Selection 3: 1; Selection 4: –3; Selection 5: 0

Question 9

Question 13

Revolt · Accepted Answer

–1

Question 10

Question 14

Revolt · Accepted Answer

1

Solving Quadratic Equations: Quadratic Formula Answers

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