Question 43833
{{{(AreaOfCardboard) - (AreaOfCutOutSquare) = TotalArea}}}
{{{(x^2) - ((x - 3)^2) = TotalArea}}}
{{{x^2 - (x^2 - 6x + 9) = TotalArea}}}
{{{x^2 - x^2 + 6x - 9 = TotalArea}}}
{{{6x - 9 = TotalArea}}}