Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 4 - Quadratic Functions and Equations - Writing Equations From Roots - Page 232: 17

Answer

$4x^2-8x+3=0$

Work Step by Step

Given the quadratic equation $ax^2+bx+c=0,$ the sum and product of its roots are given by the following ratios: \begin{align*} \text{Sum: }&-\dfrac{b}{a} \\\\ \text{Product: }&\dfrac{c}{a} .\end{align*} Given that the sum is $ 2 $ and the product is $ \dfrac{3}{4} ,$ then \begin{align*} \text{Sum: }\\ -\dfrac{b}{a}&=2 \\&=-\dfrac{-8}{4} \\\\ \text{Product: }\\ \dfrac{c}{a}&=\dfrac{3}{4} .\end{align*} Hence, $a= 4 ,$ $b= -8 ,$ and $c= 3 .$ The quadratic equation that satisfies the given sum and product is \begin{align*} 4x^2-8x+3=0 .\end{align*}
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