Q. A rectangular concrete patio has a perimeter of 36meters. Its area is 80square meters. What are the dimensions of the patio?____ meters by ____ meters
Rectangle Perimeter Equation: Let l and w be the length and width of the rectangle, respectively.The perimeter of a rectangle is given by P=2l+2w.Given P=36 meters, we can write the equation:2l+2w=36Simplify by dividing everything by 2:l+w=18
Rectangle Area Equation: We also know the area of the rectangle is A=lw and it's given as 80 square meters.So, we have the equation:lw=80
Solving for Width: From the perimeter equation l+w=18, solve for one variable in terms of the other. Let's solve for w: w=18−l
Substitute into Area Equation: Substitute w=18−l into the area equation lw=80:l(18−l)=80Expand the equation:18l−l2=80Rearrange to form a quadratic equation:l2−18l+80=0
Quadratic Equation Solution: Solve the quadratic equation using the quadratic formula, l=2a−b±b2−4ac, where a=1, b=−18, and c=80: l=2⋅1−(−18)±(−18)2−4⋅1⋅80l=218±324−320l=218±4l=218±2l=10 or l=8
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