Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 11 - Quadratic Functions and Equations - Review Exercises: Chapter 11 - Page 773: 35

Answer

$f\left( x \right)={{x}^{2}}-9x+14$, the $y$-intercept is $\left( 0,f\left( 0 \right) \right)\text{ or }\underline{\left( \text{0,14} \right)}$ and the $x-$intercepts are $\underline{\left( 2,0 \right)}\text{ and }\underline{\left( 7,0 \right)}$

Work Step by Step

The $y$-intercept is $\left( 0,f\left( 0 \right) \right)\text{ or }\left( \text{0,14} \right)$ To find the $x$-intercept, solve the equation, $y=0\text{ or }f\left( x \right)={{x}^{2}}-9x+14=0$ Rewrite the above equation and factor. $\begin{align} & {{x}^{2}}-7x-2x+14=0 \\ & x\left( x-7 \right)-2\left( x-7 \right)=0 \\ & \left( x-2 \right)\left( x-7 \right)=0 \\ & x-2=0\text{ or }x-7=0 \end{align}$ Therefore the $x-$intercepts are $\left( 2,0 \right)\text{ and }\left( 7,0 \right)$
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