Answer
4
Work Step by Step
$x^2-4x+$ ___
$a=1 \qquad b=-4$
$x^2-4x+(\frac{b}{2})^2$
$x^2-4x+(\frac{-4}{2})^2$
$x^2-4x+4$
$(x-2)^2$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 10 - Analytic Geometry - 10.2 The Parabola - 10.2 Assess Your Understanding - Page 646: 2
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