Square vs rectangle

Square and rectangle have the same area contents. The length of the rectangle is 9 greater and width 6 less than side of the square. Calculate the side of a square.


a =  18


S1=S2 a2=(a+9)(a6) a2=a2+9a6a9 6 3a=9 6=18 a=9 6/3=18 S1=a2=182=324 S2=(a+9) (a6)=(18+9) (186)=324S_{1}=S_{2} \ \\ a^2=(a+9)(a-6) \ \\ a^2=a^2+9a-6a-9 \cdot \ 6 \ \\ 3a=9 \cdot \ 6=18 \ \\ a=9 \cdot \ 6/3=18 \ \\ S_{1}=a^2=18^2=324 \ \\ S_{2}=(a+9) \cdot \ (a-6)=(18+9) \cdot \ (18-6)=324

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