Pregunta
1. Determine the value(s) of \( x \) in the equation below: \[ \frac{8}{x}=\frac{x}{2} \]
Ask by Rowe Harrington. in the United States
Jan 23,2025
Solución de tutoría real
Respuesta verificada por el tutor
Responder
The solutions are \( x = 4 \) and \( x = -4 \).
Solución
To solve the equation:
\[
\frac{8}{x} = \frac{x}{2}
\]
**Step 1: Eliminate the Fractions**
To eliminate the denominators, multiply both sides of the equation by \( 2x \) (assuming \( x \neq 0 \)):
\[
2x \cdot \frac{8}{x} = 2x \cdot \frac{x}{2}
\]
**Step 2: Simplify Both Sides**
\[
2x \cdot \frac{8}{x} = 16 \quad \text{(since \( x \) cancels out)}
\]
\[
2x \cdot \frac{x}{2} = x^2 \quad \text{(since 2 and 2 cancel out)}
\]
Now the equation becomes:
\[
16 = x^2
\]
**Step 3: Solve for \( x \)**
To find \( x \), take the square root of both sides:
\[
x = \sqrt{16} \quad \text{or} \quad x = -\sqrt{16}
\]
\[
x = 4 \quad \text{or} \quad x = -4
\]
**Step 4: Verify the Solutions**
It's good practice to substitute the solutions back into the original equation to ensure they are valid.
1. **For \( x = 4 \):**
\[
\frac{8}{4} = \frac{4}{2} \Rightarrow 2 = 2 \quad \text{(True)}
\]
2. **For \( x = -4 \):**
\[
\frac{8}{-4} = \frac{-4}{2} \Rightarrow -2 = -2 \quad \text{(True)}
\]
**Conclusion**
The solutions to the equation \( \frac{8}{x} = \frac{x}{2} \) are:
\[
x = 4 \quad \text{and} \quad x = -4
\]
Revisado y aprobado por el equipo de tutoría de UpStudy
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The Deep Dive
To solve the equation \( \frac{8}{x} = \frac{x}{2} \), you can start by cross-multiplying to eliminate the fractions. This gives you: \[ 8 \cdot 2 = x \cdot x, \] which simplifies to: \[ 16 = x^2. \] Now, by taking the square root of both sides, you find: \[ x = 4 \quad \text{or} \quad x = -4. \] So the values of \( x \) are \( 4 \) and \( -4 \).
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