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.f(x) = x2 + 6x + 8g(x) = x2 + 4x + 8h(x) = x2 – 12x + 32k(x) = x2 + 4x – 1 p(x) = 5x2 + 5x + 4t(x) = x2 – 2x – 15

Revolt · Accepted Answer

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

Question 2

Use the drop-down menus to complete the statements about the function p(x) = x(x – 1) + 1.

Revolt · Accepted Answer

The value of a is .: 1; The value of b is .: –1; The value of c is .: 1; The value of the discriminant is .: –3; The quadratic function will intersect the x-axis times.: 0

Question 3

Haley substituted the values of a, b, and c into the quadratic formula below.

Revolt · Accepted Answer

: 84112; : -10; : -2

Question 4

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

Revolt · Accepted Answer

A: x = –1.5, 0.5

Question 5

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

Revolt · Accepted Answer

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

Question 6

Where does f(x) = 3x2 – 11x – 4 intersect the x-axis?

Revolt · Accepted Answer

: 84118; : 4

Question 7

What are the zeros of the function f(x) = x2 + 8x + 4, expressed in simplest radical form?

Revolt · Accepted Answer

A: x = –4 ± 2

Question 8

Use the drop-down menus to complete the statements about the function p(x) = x(x – 1) + 1.

Revolt · Accepted Answer

C: ✔ 1

Question 9

Question 9

Revolt · Accepted Answer

-10

Question 10

Question 10

Revolt · Accepted Answer

4

Solving Quadratic Equations: Quadratic Formula Answers

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