AnswersFL-1200710-Mathematics for College Algebra ASolving Quadratic Equations: Completing the Square

Solving Quadratic Equations: Quadratic Formula Answers

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1
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A quadratic equation has exactly one real number solution. Which is the value of its discriminant?

A
−1
B
0
C
1
D
2
2
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Rhett is solving the quadratic equation 0= x2 – 2x – 3 using the quadratic formula. Which shows the correct substitution of the values a, b, and c into the quadratic formula?Quadratic formula: x =

Question illustration
A
StartFraction 2 plus or minus StartRoot (negative 2) squared minus 4(1)(negative 3) EndRoot Over 2(1) EndFraction
Option A
B
StartFraction negative 2 plus or minus StartRoot (negative 2) squared minus 4(1)(negative 3) EndRoot Over 2(1) EndFraction
Option B
C
StartFraction 2 plus or minus StartRoot negative 2 squared minus 4(1)(negative 3) EndRoot Over 2(1) EndFraction
Option C
D
StartFraction negative 2 plus or minus StartRoot negative 2 squared minus 4(1)(negative 3) EndRoot Over 2(1) EndFraction
Option D
3

What is the discriminant of the quadratic equation 0 = 2x2 + 3x – 5?

A
–37
B
–31
C
43
D
49
4

What is the positive solution to the equation 0 = –x2 + 2x + 1?Quadratic formula: x =

Question illustration
A
–2 +
Option A
B
2 –
Option B
C
1 +
Option C
D
–1 +
Option D
5

What is the discriminant of the quadratic equation 0 = –x2 + 4x – 2?

A
–4
B
8
C
12
D
24
6

In simplest radical form, what are the solutions to the quadratic equation 0 = –3x2 – 4x + 5?Quadratic formula: x =

Question illustration
A
x =
Option A
B
x =
Option B
C
x =
Option C
D
x =
Option D
7

What is the value of the discriminant of the quadratic equation -2x2=-8x+8, and what does its value mean about the number of real number solutions the equation has?

A
The discriminant is equal to 0, which means the equation has no real number solutions.
B
The discriminant is equal to 0, which means the equation has one real number solution.
C
The discriminant is equal to 128, which means the equation has no real number solutions.
D
The discriminant is equal to 128, which means the equation has two real number solutions.
8

Anderson uses the discriminant to correctly find the number of real solutions of the quadratic equation x2 + 4x + 8 = 0. Which explanation could Anderson provide?

Question illustration
A
The equation has no real number solutions because the discriminant is 0.
B
The equation has one real number solution because the discriminant is 0.
C
The equation has no real number solutions because the discriminant is less than 0.
D
The equation has two real number solutions because the discriminant is greater than 0.
9

In simplest radical form, what are the solutions to the quadratic equation 6 = x2 – 10x?Quadratic formula: x =

Question illustration
A
x = 5
Option A
B
x = 5
Option B
C
x = 5
Option C
D
x = 5
Option D
10

What is the discriminant of the quadratic equation 3 – 4x = –6x2?

A
–68
B
–56
C
76
D
88

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