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The difference of the squares of two positive consecutive even integes is 68 . Find the integers. Use the fat that, if \( x \) represents an even integer, ther \( x+2 \) represents the next consecutiv integer.

Ask by Donnelly Chan. in the United States
Jan 20,2025

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Answer

The two consecutive even integers are 16 and 18.

Solution

To find two positive consecutive even integers whose squares differ by 68, follow these steps: 1. **Define the Variables:** - Let \( x \) represent the first even integer. - Since the integers are consecutive even numbers, the next integer is \( x + 2 \). 2. **Set Up the Equation:** - According to the problem, the difference of their squares is 68. - This can be written as: \[ (x + 2)^2 - x^2 = 68 \] 3. **Expand and Simplify:** \[ (x + 2)^2 - x^2 = 68 \\ x^2 + 4x + 4 - x^2 = 68 \\ 4x + 4 = 68 \] 4. **Solve for \( x \):** \[ 4x + 4 = 68 \\ 4x = 68 - 4 \\ 4x = 64 \\ x = \frac{64}{4} \\ x = 16 \] 5. **Find the Two Integers:** - First integer: \( x = 16 \) - Second integer: \( x + 2 = 16 + 2 = 18 \) 6. **Verification:** - \( 16^2 = 256 \) - \( 18^2 = 324 \) - Difference: \( 324 - 256 = 68 \), which matches the given condition. **Answer:** The two consecutive even integers are **16 and 18**.

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Bonus Knowledge

Let's set up the problem using the information given. Let the first even integer be \( x \). Then, the next consecutive even integer is \( x + 2 \). The difference of their squares can be expressed as: \[ (x + 2)^2 - x^2 = 68 \] Expanding both squares, we have: \[ (x^2 + 4x + 4) - x^2 = 68 \] This simplifies to: \[ 4x + 4 = 68 \] Subtracting 4 from both sides: \[ 4x = 64 \] Dividing by 4 gives us: \[ x = 16 \] So, the two positive consecutive even integers are \( 16 \) and \( 18 \). Check: \[ (18^2 - 16^2) = (324 - 256) = 68. \] This confirms that our integers are indeed \( 16 \) and \( 18 \). Now, if you're curious about how to approach these types of problems effectively, remember that you can always set up an equation based on the relationships provided. Using the identity of the difference of squares \( a^2 - b^2 = (a - b)(a + b) \) can make it much simpler! And for a bit of historical context, algebraic equations such as this one have roots tracing back to ancient civilizations. The Babylonians were solving quadratic-like problems around 2000 BC, laying the groundwork for the algebra we use today. It's fascinating how these mathematical ideas have evolved!

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