Given the diagram below, if P is the circumcenter of AABC, AD=8x+3, DB=17x- 15, and DP=12, find PB. Round answers to the nearest tenth when needed.

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
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Given the diagram below, if \( P \) is the circumcenter of \(\triangle ABC\), \( AD = 8x + 3 \), \( DB = 17x - 15 \), and \( DP = 12 \), find \( PB \). Round answers to the nearest tenth when needed.

**Diagram Explanation:**

The diagram shows a triangle \( \triangle ABC \) with point \( P \) as its circumcenter. The lines \( AD \), \( DB \), and \( DP \) are indicated as segments within the triangle. The circumcenter \( P \) is equidistant from the vertices of the triangle, making \( PA = PB = PC \). The task is to find the length of \( PB \) given the algebraic expressions for \( AD \) and \( DB \) and the specific length of \( DP \).

**Solution Steps:**

1. Set \( AD = DB \) because both distances add up to the same line \( AB \).
2. Solve for \( x \) using the equations:
   \[
   8x + 3 = 17x - 15
   \]
3. Simplify the equation:
   \[
   8x + 3 = 17x - 15 \implies 18 = 9x \implies x = 2
   \]
4. Substitute \( x = 2 \) back to find \( AD \):
   \[
   AD = 8(2) + 3 = 19 
   \]
5. Verify \( DB \) with \( x = 2 \):
   \[
   DB = 17(2) - 15 = 19
   \]
6. Calculate \( PB \):
   - Since \( P \) is the circumcenter, and given \( DP = 12 \), \( PB = PD = 12 \).

So, \( PB = 12 \).
Transcribed Image Text:Given the diagram below, if \( P \) is the circumcenter of \(\triangle ABC\), \( AD = 8x + 3 \), \( DB = 17x - 15 \), and \( DP = 12 \), find \( PB \). Round answers to the nearest tenth when needed. **Diagram Explanation:** The diagram shows a triangle \( \triangle ABC \) with point \( P \) as its circumcenter. The lines \( AD \), \( DB \), and \( DP \) are indicated as segments within the triangle. The circumcenter \( P \) is equidistant from the vertices of the triangle, making \( PA = PB = PC \). The task is to find the length of \( PB \) given the algebraic expressions for \( AD \) and \( DB \) and the specific length of \( DP \). **Solution Steps:** 1. Set \( AD = DB \) because both distances add up to the same line \( AB \). 2. Solve for \( x \) using the equations: \[ 8x + 3 = 17x - 15 \] 3. Simplify the equation: \[ 8x + 3 = 17x - 15 \implies 18 = 9x \implies x = 2 \] 4. Substitute \( x = 2 \) back to find \( AD \): \[ AD = 8(2) + 3 = 19 \] 5. Verify \( DB \) with \( x = 2 \): \[ DB = 17(2) - 15 = 19 \] 6. Calculate \( PB \): - Since \( P \) is the circumcenter, and given \( DP = 12 \), \( PB = PD = 12 \). So, \( PB = 12 \).
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