15. Solve for x. 71° (10x + 6)° (13x – 2)° (8x-1)

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
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## Problem 15: Solve for \( x \).

### Problem Statement:
You are given a quadrilateral with the internal angles defined algebraically. The four angles are denoted as follows:

1. Top-left angle: \( (10x + 6)^\circ \)
2. Bottom-left angle: \( (13x - 2)^\circ \)
3. Bottom-right angle: \( (8x - 1)^\circ \)
4. Top-right angle: \( 71^\circ \)

### Task:
Solve for \( x \).

#### Explanation:
In a quadrilateral, the sum of all internal angles is always \( 360^\circ \). Therefore, you can set up the following equation using the given angles:

\[
(10x + 6)^\circ + (13x - 2)^\circ + (8x - 1)^\circ + 71^\circ = 360^\circ
\]

1. Combine like terms:
\[
10x + 13x + 8x + 6 - 2 - 1 + 71 = 360
\]

2. Simplify the equation:
\[
31x + 74 = 360
\]

3. Solve for \( x \):
\[
31x + 74 - 74 = 360 - 74 \\
31x = 286 \\
x = \frac{286}{31} \\
x = 9.23
\]

Thus, the value of \( x \) is approximately \( 9.23 \).

### Conclusion:
To solve for \( x \), you recognize that the sum of the internal angles of a quadrilateral is \( 360^\circ \) and set up an equation using the given algebraic expressions for each angle. Solving this equation gives the required value of \( x \).
Transcribed Image Text:## Problem 15: Solve for \( x \). ### Problem Statement: You are given a quadrilateral with the internal angles defined algebraically. The four angles are denoted as follows: 1. Top-left angle: \( (10x + 6)^\circ \) 2. Bottom-left angle: \( (13x - 2)^\circ \) 3. Bottom-right angle: \( (8x - 1)^\circ \) 4. Top-right angle: \( 71^\circ \) ### Task: Solve for \( x \). #### Explanation: In a quadrilateral, the sum of all internal angles is always \( 360^\circ \). Therefore, you can set up the following equation using the given angles: \[ (10x + 6)^\circ + (13x - 2)^\circ + (8x - 1)^\circ + 71^\circ = 360^\circ \] 1. Combine like terms: \[ 10x + 13x + 8x + 6 - 2 - 1 + 71 = 360 \] 2. Simplify the equation: \[ 31x + 74 = 360 \] 3. Solve for \( x \): \[ 31x + 74 - 74 = 360 - 74 \\ 31x = 286 \\ x = \frac{286}{31} \\ x = 9.23 \] Thus, the value of \( x \) is approximately \( 9.23 \). ### Conclusion: To solve for \( x \), you recognize that the sum of the internal angles of a quadrilateral is \( 360^\circ \) and set up an equation using the given algebraic expressions for each angle. Solving this equation gives the required value of \( x \).
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