Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 4 - Quadratic Functions - 4.4 Solving Quadratic Equations by the Square Root Property and Completing the Square - 4.4 Exercises - Page 349: 98

Answer

See graph

Work Step by Step

The function that we want to graph is shown below. Follow the steps outline to graph the function. $$ \begin{aligned} m(p) &=6\left(p+\frac{5}{6}\right)^2+\frac{101}{6}\\ & = 6(p+0.833)^2+16.833 \end{aligned} $$ Step 1: We first determine the direction in which the function opens: The given function opens upward because the constant, $a= 6$ is positive. Step 2: Determine the vertex and the equation for the axis of symmetry. The vertex is $(-0.833,16.833)$ and the equation for the axis of symmetry is $x = -0.833$. Step 3: Find the $y$ and x intercepts. To find the y intercept, set $x= 0$ to find the value of $y$. Similarly, to find the $x$ intercept, set $ y= 0$ to find the values of $x$. $$ \begin{aligned} m(0)& =6\left(0+\frac{5}{6}\right)^2+\frac{101}{6}\\ &= 21\\ &\text{y-intercept: (0,21)}. \end{aligned} $$ Set $ y = 0$ and solve. $$ \begin{aligned} 6\left(p+\frac{5}{6}\right)^2+\frac{101}{6}& =0\\ \left(p+\frac{5}{6}\right)^2&= -\frac{101}{36}. \end{aligned} $$ The equation has no solution, therefore there are no $x$-intercepts. Step 4: Find the domain and range of the function and sketch it. Domain: All real numbers, Range: $[16.833, \infty) $.
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