Answer
$x^2+4x+3$ = $(x+1)(x+3)$
See Fig. 4 for the solution
Work Step by Step
The factored form of $x^2+4x+3$ is found by reading the
length $(x+3)$ and the width $(x+1)$ of the rectangle as shown in Fig. 4.
$x^2+4x+3$ = $(x+1)(x+3)$
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