
Concept explainers
a.
To Express: The quadratic function in standard form.
a.

Answer to Problem 13E
the quadratic function is expressed in standard form as
Explanation of Solution
Given: The function is
Calculation:
The quadratic function
The parabola opens upwards if
Solve the function:
On comparing the above equation with standard form
Therefore, the quadratic function is expressed in standard form as
b.
To Find: The vertex,
b.

Answer to Problem 13E
the vertex is
Explanation of Solution
Given: The function is
Calculation:
The quadratic function
by completing the square. The graph of the function f is a parabola with vertex
The
The
Therefore,
c.
To Sketch: The graph of the quadratic function.
c.

Explanation of Solution
Given: The function is
Graph:
The standard form of the function is:
From the standard form it is observed that the graph is a parabola that opens upward and has vertex
Use graphing calculator to graph the function:
Chapter 3 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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