Answer
Area of square = $(9{x^2} - 6x +1 ){m^2}$, where ${m^2}$ is meters squared (units of area).
Work Step by Step
Area of square = $({Side^2})$
Here, side = (3x -1) meters.
${(3x-1)^2} $ = ${(3x)^2} + 2(3x)(-1) + ({-1^2})$
= $9{x^2} - 6x +1$
Hence the area = $(9{x^2} - 6x +1 ){m^2}$, where ${m^2}$ is meters squared (units of area).