Math Problem Statement
Solution
Let's break down the given problem step by step to find the length of the rectangle.
We are told:
- The length of the rectangle is 5 cm greater than twice the width.
- The area of the rectangle is 33 cm².
Let:
- be the width of the rectangle.
- be the length of the rectangle.
From the first condition, we can write the length in terms of the width: The area of a rectangle is given by: Substitute the value of from the first equation: This simplifies to: Rearrange this into a standard quadratic form:
Now, we solve this quadratic equation using the quadratic formula: where , , and .
Substitute these values into the formula:
So, we get two solutions:
Since the width cannot be negative, we have cm.
Now, substitute back into the equation for the length:
Thus, the length of the rectangle is 11 cm.
The correct answer is B) 11 cm.
Would you like more details, or do you have any questions?
Here are 5 related questions to consider:
- How would the solution change if the area were different?
- What happens if the relationship between length and width changes?
- Can you solve for the width if only the length and area are given?
- What are the implications of a quadratic equation having two solutions in this context?
- How can the quadratic formula help solve other geometry problems?
Tip: When solving quadratic equations, always check both potential solutions to see if they make sense within the context of the problem.
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Math Problem Analysis
Mathematical Concepts
Algebra
Quadratic Equations
Geometry
Formulas
Area of a rectangle = length × width
Quadratic formula: x = (-b ± √(b² - 4ac)) / 2a
Theorems
Quadratic formula
Suitable Grade Level
Grades 7-9
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