Introduction to Quadratic Functions Answers

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1
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Which is a quadratic function?

A
f(x) = 2x + x + 3
B
f(x) = 0x2 – 4x + 7
C
f(x) = 5x2 – 4x + 5
D
f(x) = 3x3 + 2x + 2
78850

00.55✔ 12.5

A
0
B
0.5
C
5
D
✔ 12.5
78853

–203✔ 4

A
–2
B
0
C
3
D
✔ 4
78863

⇒ -2

Answer:

78863

78865

Consider the quadratic function f(x) = x2 – 5x + 6.

Answers:
Blank 1:78842
Blank 2:-5
Blank 3:6
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Which table represents a quadratic function?

A
[Image: A 2-column table with 5 rows. The first column is ...]
Option A
B
[Image: A 2-column table with 5 rows. The first column is ...]
Option B
C
[Image: A 2-column table with 5 rows. The first column is ...]
Option C
D
[Image: A 2-column table with 5 rows. The first column is ...]
Option D
78868

✔ –2–1/21/22

A
✔ –2
B
–1/2
C
1/2
D
2
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Which graph has a rate of change equal to in the interval between 0 and 3 on the x-axis?

Question illustration
A
[Image: On a coordinate plane, solid circles appear on a s...]
Option A
B
[Image: On coordinate plane, a parabola opens up. Solid ci...]
Option B
C
[Image: On a coordinate plane, solid circles appear on a s...]
Option C
D
[Image: On a coordinate plane, a curved line opens up and ...]
Option D
78872

Which function increases at a faster rate on 0 to infinity, f(x) = x2 or g(x) = 2x? Explain your reasoning.

Answer:

The exponential function g(x) = 2^x increases at a faster rate than the quadratic function f(x) = x^2 over the interval [0, infinity). By comparing output values, such as f(x): 0, 1, 4, 9, 16 and g(x): 1, 2, 4, 8, 16, we see that the exponential function eventually doubles its way to much higher values. Because exponential growth (doubling) is multiplicative, it will always exceed the growth of a quadratic function as x increases.

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What did you include in your response? Check all that apply.

A
Find the output values for each function.
B
Doubling each time results in a greater rate of change.
C
The exponential function increases at a faster rate than the quadratic function.

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