#### Answer

$(x-9)^2$

#### Work Step by Step

$x^2-18x+81$
$=x^2-2*x*9+9^2$
$=(x-9)^2$

Published by
Prentice Hall

ISBN 10:
0133281140

ISBN 13:
978-0-13328-114-9

$(x-9)^2$

$x^2-18x+81$
$=x^2-2*x*9+9^2$
$=(x-9)^2$

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