Hammond Griffiths
05/25/2023 · Middle School
The length of a rectangle is 5 meters less than twice the width. If the area of the rectangle is 493 square m The width is \( \square \) meters. The length is \( \square \) meters.
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Step-by-step Solution
Let's denote the width of the rectangle as \( w \) meters.
Given that the length of the rectangle is 5 meters less than twice the width, we can express the length as \( 2w - 5 \) meters.
The area of a rectangle is given by the formula: Area = Length * Width.
We are given that the area of the rectangle is 493 square meters. Therefore, we can set up the equation:
\[ (2w - 5) \times w = 493 \]
Now, we need to solve this equation to find the value of \( w \), which represents the width of the rectangle.
Let's solve the equation step by step.
Solve the quadratic equation by following steps:
- step0: Solve by factoring:
\(\left(2w-5\right)w=493\)
- step1: Multiply the terms:
\(w\left(2w-5\right)=493\)
- step2: Expand the expression:
\(2w^{2}-5w=493\)
- step3: Move the expression to the left side:
\(2w^{2}-5w-493=0\)
- step4: Factor the expression:
\(\left(w-17\right)\left(2w+29\right)=0\)
- step5: Separate into possible cases:
\(\begin{align}&w-17=0\\&2w+29=0\end{align}\)
- step6: Solve the equation:
\(\begin{align}&w=17\\&w=-\frac{29}{2}\end{align}\)
- step7: Rewrite:
\(w_{1}=-\frac{29}{2},w_{2}=17\)
The solutions to the equation are \( w = -\frac{29}{2} \) and \( w = 17 \).
Since the width of a rectangle cannot be negative, we discard the solution \( w = -\frac{29}{2} \).
Therefore, the width of the rectangle is 17 meters.
Now, we can find the length of the rectangle by substituting the value of \( w \) into the expression for the length:
Length = \( 2w - 5 \)
Substitute \( w = 17 \) into the expression:
Length = \( 2(17) - 5 \)
Length = \( 34 - 5 \)
Length = 29 meters
Therefore, the length of the rectangle is 29 meters.
Quick Answer
The width is 17 meters. The length is 29 meters.
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