Answer
$x^2+6x+9$ = $(x+3)(x+3)$ = $(x+3)^2$
See Fig. 5 for the solution.
Work Step by Step
The factored form of $x^2+6x+9$ is found by reading the
length $(x+3)$ and the width $(x+3)$ of the square as shown in Fig. 5.
$x^2+6x+9$ = $(x+3)(x+3)$ = $(x+3)^2$
