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Solve the equation $x^{2}+4 x+3=0$ by completing the square.$\newline$Drag numbers to the lines to complete the solution to the equation.$\newline$Step $1$: $x^{2}+4 x+3=0$$\newline$Step $2:\left(x^{2}+4 x+\ldots\right)+\ldots+3=0$$\newline$Step $3$: $(x+\ldots)^{2}=$$\newline$Step $4: x+\ldots= \pm$$\newline$Solution: $x=$ and $x=$$\newline$$-4$$\newline$$-3$$\newline$$-2$$\newline$$x^{2}+4 x+3=0$$0$$\newline$$0$$\newline$$1$$\newline$$2$$\newline$$3$$\newline$$4$