Question
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\( \left. \begin{array} { r r } { \sqrt { ( 5 - b ) ^ { 2 } + ( 4 - 0 ) ^ { 2 } } = \sqrt { 32 } } & { ( 5 - b ) ^ { 2 } + 4 ^ { 2 } = 32 } \\ { \sqrt { ( 5 - b ) ^ { 2 } + 4 ^ { 2 } } = \sqrt { 32 } } & { ( 5 - b ) ^ { 2 } = 16 } \end{array} \right. \)

Ask by Moreno Wagner. in Hong Kong
Jan 23,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

\( b = 1 \) 或 \( b = 9 \)

Solution

根據兩點之間的距離公式,我們可以進行以下的計算步驟: \[ \begin{array}{rl} \sqrt{(5 - b)^2 + (4 - 0)^2} &= \sqrt{32} \\ (5 - b)^2 + 4^2 &= 32 \\ \sqrt{(5 - b)^2 + 16} &= \sqrt{32} \\ (5 - b)^2 &= 16 \\ \end{array} \] **步驟解析:** 1. **應用距離公式:** 兩點 \((b, 0)\) 與 \((5, 4)\) 之間的距離公式為: \[ \sqrt{(5 - b)^2 + (4 - 0)^2} = \sqrt{32} \] 2. **平方兩邊以去除平方根:** \[ (5 - b)^2 + 4^2 = 32 \] 計算 \(4^2\) 得: \[ (5 - b)^2 + 16 = 32 \] 3. **移項並簡化方程式:** \[ (5 - b)^2 = 32 - 16 \] \[ (5 - b)^2 = 16 \] 4. **解二次方程式:** 對於 \((5 - b)^2 = 16\),我們取平方根得到: \[ 5 - b = \pm 4 \] 這產生兩個可能的解: - 當 \(5 - b = 4\) 時,解得 \(b = 1\) - 當 \(5 - b = -4\) 時,解得 \(b = 9\) **最終解答:** \( b = 1 \) 或 \( b = 9 \)

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The Deep Dive

To solve the equation, you start with the expression \( \sqrt{(5 - b)^2 + 4^2} = \sqrt{32} \). Squaring both sides leads you to \( (5 - b)^2 + 16 = 32 \). Subtract 16 from both sides to isolate the squared term, giving you \( (5 - b)^2 = 16 \). Taking the square root of both sides results in two potential equations: \( 5 - b = 4 \) and \( 5 - b = -4 \). Solving these will reveal the values for \( b \). As you find the value of \( b \), remember that equations like these can stem from real-world situations, such as determining the distance between two points on a coordinate plane. For example, in navigation or gaming, knowing distance can influence strategy or position. So, if you apply this concept to everyday scenarios, you'll see how this mathematical idea helps plan routes or make calculations in your favorite games!

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