the area of this rectangular (the small one ) مركز تحميل الملفات
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$\displaystyle A=60 \cdot 40-2\cdot\left(\frac{(60-x)(40-x)}{2}+\frac{x\cdot x}{2}\right)$ $\displaystyle A= 60\cdot 40-(2400-100x+x^2+x^2)$ $\displaystyle A=100x-2x^2 ~\text{ where }~x\in(0,40)$
Can you explain your answer? thanks
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