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 8 - Graphing Quadratic Functions - 8.3 - Graphing f(x) = ax^2 + bx + c - Monitoring Progress - Page 434: 7

Answer

The function has a minimum value. The minimum value is $4$.

Work Step by Step

Comparing $g(x)=8x^{2}-8x+6$ with $ax^{2}+bx+c$, we see that $a=8$ and $b=-8$. 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 $x=-\frac{b}{2a}=-\frac{-8}{2(8)}=\frac{1}{2}$ Evaluating the function at $x=\frac{1}{2}$, we get the y-coordinate of the vertex as $g(\frac{1}{2})=8(\frac{1}{2})^{2}-8(\frac{1}{2})+6=4$
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