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Math Help - the area of rectangular

  1. #1
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    the area of rectangular

    the area of this rectangular (the small one )

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  2. #2
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    Crna Gora
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    Re: the area of rectangular

    A=60 \cdot 40-2\cdot\left(\frac{(60-x)(40-x)}{2}+\frac{x\cdot x}{2}\right)

    A= 60\cdot 40-(2400-100x+x^2+x^2)

    A=100x-2x^2 ~\text{ where }~x\in(0,40)
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  3. #3
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    Re: the area of rectangular

    Can you explain your answer?

    thanks
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