Question
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Use indirect reasoning to show that there is no whole number, \( n \), which solves the equation \( 4 n+14=41 \). Is the number 41 even or odd? odd even Is the number 14 even or odd? odd Is the number \( 4 n \) even or odd? odd even is the sum \( 4 n+14 \) even or odd? odd even

Ask by Chang Clarke. in the United States
Mar 09,2025

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Answer

There is no whole number \( n \) that satisfies the equation \( 4n + 14 = 41 \). This is because \(41\) is odd, while \(4n + 14\) is always even, making the equation impossible to solve with whole numbers.

Solution

1. Assume there exists a whole number \( n \) such that \[ 4n + 14 = 41. \] 2. Notice that \(41\) is an odd number. 3. The number \(14\) is even. 4. For any whole number \( n \), the product \(4n\) is even (because \(4\) is even and the product of an even number with any whole number is even). 5. The sum of two even numbers is even; therefore, the left-hand side, \(4n + 14\), must be even. 6. We now have that \(4n + 14\) is even while the right-hand side is odd. This is a contradiction, since an even number cannot equal an odd number. 7. Thus, by indirect reasoning (proof by contradiction), there is no whole number \( n \) that satisfies the equation. - The number \(41\) is odd. - The number \(14\) is even. - The term \(4n\) is even. - The sum \(4n + 14\) is even.

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To show there is no whole number \( n \) that solves \( 4n + 14 = 41 \) using indirect reasoning, start by rewriting the equation as \( 4n = 41 - 14 \), which simplifies to \( 4n = 27 \). Since \( n \) must be a whole number, it follows that \( n = \frac{27}{4} = 6.75 \). But 6.75 is not a whole number, so we conclude that no whole number \( n \) satisfies the equation. As for the nature of the numbers involved, the number 41 is odd, while 14 is even. Since \( 4n \) is always even (as it is a multiple of 4), the sum \( 4n + 14 \) remains even. Thus, the scenario where an even result (from the sum) equals an odd number (41) is impossible, reinforcing that no suitable whole number \( n \) exists.

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