Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 8 - Section 8.3 - Quadratic Functions and Their Graphs - Exercise Set - Page 626: 21

Answer

The graph is shown below. Range $[1,\infty)$.

Work Step by Step

Add $1$ to both sides of the given equation. $y-1+1=(x-3)^2+1$ Simplify. $y=(x-3)^2+1$ Let $y=f(x)$. $f(x)=(x-3)^2+1$ The standard form of the parabola is $f(x)=a(x-h)^2+k$ Compare with the original given function. $a=1,h=3$ and $k=1$ Step 1:- Parabola opens. $a>0$, The parabola opens upward. Step 2:- Vertex. The value of $h=3$ and $k=1$. The vertex is $(h,k)=(3,1)$. Step 3:- $x-$intercepts. Replace $f(x)$ with $0$. $\Rightarrow 0=(x-3)^2+1$ Subtract $1$ from both sides. $\Rightarrow 0-1=(x-3)^2+1-1$ Simplify. $\Rightarrow -1=(x-3)^2$ Apply the square root property. $\Rightarrow x-3=\sqrt{-1}$ or $x-3=-\sqrt{-1}$ Hence, the equation has imaginary solutions, there are no $x-$intercepts. Step 4:- $y-$intercept. Replace $x$ with $0$. $\Rightarrow f(0)=(0-3)^2+1$ Simplify. $\Rightarrow f(0)=9+1$ Simplify. $\Rightarrow f(0)=10$ Hence, the $y-$intercept is $10$. The parabola passes through $(0,10)$. Step 5:- Graph. Use the points vertex and $y-$intercept to draw a parabola. The axis of symmetry is $x=h=3$. $A=(3,1)$ $B=(0,10)$. From the graph the range of the function is $[1,\infty)$.
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