Question
What are the solutions to the equation \( x-\frac{7}{x}=6 ? \)
Ask by Bob Paul. in the United States
Mar 11,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The solutions are \(x=-1\) and \(x=7\).
Solution
Solve the equation \( x-\frac{7}{x}=6 \).
Solve the equation by following steps:
- step0: Solve for \(x\):
\(x-\frac{7}{x}=6\)
- step1: Find the domain:
\(x-\frac{7}{x}=6,x\neq 0\)
- step2: Multiply both sides of the equation by LCD:
\(\left(x-\frac{7}{x}\right)x=6x\)
- step3: Simplify the equation:
\(x^{2}-7=6x\)
- step4: Move the expression to the left side:
\(x^{2}-7-6x=0\)
- step5: Factor the expression:
\(\left(x-7\right)\left(x+1\right)=0\)
- step6: Separate into possible cases:
\(\begin{align}&x-7=0\\&x+1=0\end{align}\)
- step7: Solve the equation:
\(\begin{align}&x=7\\&x=-1\end{align}\)
- step8: Check if the solution is in the defined range:
\(\begin{align}&x=7\\&x=-1\end{align},x\neq 0\)
- step9: Find the intersection:
\(\begin{align}&x=7\\&x=-1\end{align}\)
- step10: Rewrite:
\(x_{1}=-1,x_{2}=7\)
The solutions to the equation \(x-\frac{7}{x}=6\) are \(x=-1\) and \(x=7\).
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Extra Insights
To solve the equation \( x - \frac{7}{x} = 6 \), we first multiply through by \( x \) (assuming \( x \neq 0 \)) to eliminate the fraction, resulting in \( x^2 - 7 = 6x \). Rearranging this gives us a standard quadratic equation: \( x^2 - 6x - 7 = 0 \). Next, we can factor it as \( (x - 7)(x + 1) = 0 \). Therefore, the solutions are \( x = 7 \) and \( x = -1 \). Now, if we substitute these values back into the original equation, both will satisfy it, confirming they are indeed the correct solutions!