
(a)
To graph: the given quadratic function
(a)

Answer to Problem 18RE
Explanation of Solution
Given:
Calculation:
graph the function
at
Now, solve
The vertex is at
Since
The graph of
Conclusion:
Thus, the given equation is drawn.
(b)
the domain and the range of the function.
(b)

Answer to Problem 18RE
The domain of
The range is
Explanation of Solution
Calculation:
Determine the range and domain of the function
The domain of quadratic equation is all real numbers
For the range, find the minimum and maximum value of function. The graph of the function
Conclusion:
The domain of quadratic equation is all real numbers
The range is
(c)
the increasing and decreasing interval.
(c)

Answer to Problem 18RE
Decreasing interval
Explanation of Solution
Calculation:
Determine whether the function
Conclusion:
Hence, decreasing interval
Chapter 3 Solutions
Precalculus
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