AnswersHigh School Math 2 AIntroduction to Quadratic Functions

Introduction to Quadratic Functions Answers

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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
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Which table represents a quadratic function?

A
Option A
B
Option B
C
Option C
D
Option D
14

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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