Answer
On the $x$-axis
Work Step by Step
$$f(x)=9x^2-24x+16$$
$$D=b^2-4ac=(-24)^2-4(9)(16)=576-576=0$$
Since the discriminant is zero (one $x$-intercept), the vertex is on the $x$-axis.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
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 - 9.5 - Solving Quadratic Equations Using the Quadratic Formula - Exercises - Page 523: 68
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