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 - Chapter Review - Page 535: 24

Answer

The function has a minimum value. The minimum value is $7$.

Work Step by Step

Comparing $f(x)=x^{2}+4x+11$ with $ax^{2}+bx+c$, we see that $a=1$ and $b=4$. As $a\gt0$, the parabola opens up and the function has a minimum value. The minimum value is the y-coordinate of the vertex. The x-coordinate of the vertex is given by $x=-\frac{b}{2a}=-\frac{4}{2(1)}=-2$ Evaluating the function at $x=-2$, we get the y-coordinate of the vertex as $f(-2)=(-2)^{2}+4(-2)+11=7$
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