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 9 - Solving Quadratic Equations - 9.4 - Solving Quadratic Equations by Completing the Square - Exercises - Page 512: 42

Answer

The function has a minimum value of $1$.

Work Step by Step

The given function is $\Rightarrow y=x^2+6x+10$ Subtract $1$ from each side. $\Rightarrow y-1=x^2+6x+10-1$ Simplify. $\Rightarrow y-1=x^2+6x+9$ Write the right side as the square of a binomial. $\Rightarrow y-1=(x+3)^2$ Write in vertex form. $\Rightarrow y=(x+3)^2+1$ The vertex is $(-3,1)$. Because $a$ is positive $(a=1)$, the parabola opens up and the $y-$coordinate of the vertex is the minimum value. Hence, the function has a minimum value of $1$.
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