Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 7 - Polynomial Equations and Factoring - 7.4 - Solving Polynomial Equations in Factored Form - Monitoring Progress - Page 380: 10

Answer

$x=0$ and $x=\frac{1}{2}$.

Work Step by Step

The given equation is $\Rightarrow 4x^2=2x$ Subtract $2x$ from each side. $\Rightarrow 4x^2-2x=2x-2x$ Simplify. $\Rightarrow 4x^2-2x=0$ Factor out $2x$. $\Rightarrow 2x(2x-1)=0$ Use zero-product property rule. $\Rightarrow 2x=0$ or $2x-1=0$ Solve for $x$. $\Rightarrow x=0$ or $x=\frac{1}{2}$ Check:- $x=0$ $\Rightarrow 4(0)^2=2(0)$ $\Rightarrow 4(0=2(0)$ $\Rightarrow 0=0$ True. Check:- $x=\frac{1}{2}$ $\Rightarrow 4(\frac{1}{2})^2=2(\frac{1}{2})$ $\Rightarrow 4(\frac{1}{4})=1$ $\Rightarrow 1=1$ True. Hence, the solutions are $x=0$ and $x=\frac{1}{2}$.
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