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Suppose that a rectangle has a perimeter of 24 meters. Express the area A(x) of the rectangle in terms of the length x of one of its sides. A(x) = ??

Sagot :

luana
[tex]x-\ length\\\\y-\ width\\\\ A(x)=xy\\\\ Perimeter=2x+2y\\ 24=2x+2y\ \ \ |Subtract\ 2x\\ 24-2x=2y\ \ \ |Divide\ by\ 2\\ y=\frac{24-2x}{2}=12-x\\\\ A(x)=x(12-x)=12x-x^2\\\\ Area\ of\ rectngle\ can\ be\ expressed\ as\ A(x)=-x^2+12x[/tex]
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