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Solve \( 3-\frac{4}{x-3}=\frac{5}{x} \) \( x=\square \) or \( x=\square \)

Ask by Chang Mcguire. in the United States
Mar 10,2025

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Tutor-Verified Answer

Answer

\( x=1 \) or \( x=5 \).

Solution

We start with the equation \[ 3-\frac{4}{x-3}=\frac{5}{x}. \] **Step 1.** Multiply both sides by the common denominator \( x(x-3) \) (note that \( x \neq 0 \) and \( x \neq 3 \)): \[ x(x-3) \left( 3-\frac{4}{x-3} \right) = x(x-3) \cdot \frac{5}{x}. \] **Step 2.** Distribute and simplify: \[ 3x(x-3) - 4x = 5(x-3). \] **Step 3.** Expand the terms: \[ 3x^2 - 9x - 4x = 5x - 15. \] Combine like terms: \[ 3x^2 - 13x = 5x - 15. \] **Step 4.** Move all terms to one side to set the equation to zero: \[ 3x^2 - 13x - 5x + 15 = 0, \] which simplifies to: \[ 3x^2 - 18x + 15 = 0. \] **Step 5.** Divide the entire equation by 3: \[ x^2 - 6x + 5 = 0. \] **Step 6.** Factor the quadratic: \[ (x-1)(x-5)=0. \] **Step 7.** Solve for \( x \): \[ x-1=0 \quad \text{or} \quad x-5=0, \] which gives: \[ x=1 \quad \text{or} \quad x=5. \] Thus, the solutions are: \[ x=1 \quad \text{or} \quad x=5. \]

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Beyond the Answer

To solve the equation \( 3 - \frac{4}{x-3} = \frac{5}{x} \), first, let's eliminate the fractions by finding a common denominator, which is \( x(x-3) \). Multiplying every term by \( x(x-3) \) gives: \( 3x(x-3) - 4x = 5(x-3) \) Expanding each term: \( 3x^2 - 9x - 4x = 5x - 15 \) Now simplify and combine like terms: \( 3x^2 - 13x + 15 = 0 \) Next, we can factor this quadratic equation. We need two numbers that multiply to \( 3 \times 15 = 45 \) and add to \( -13 \). Those numbers are \( -5 \) and \( -9 \). Thus, we can rewrite the equation as: \( 3x^2 - 5x - 9x + 15 = 0 \) Factoring by grouping gives us: \( (3x^2 - 5x) + (-9x + 15) = 0 \) Factoring further: \( x(3x - 5) - 3(3x - 5) = 0 \) This results in: \( (3x - 5)(x - 3) = 0 \) Setting each factor to zero gives: \( 3x - 5 = 0 \) or \( x - 3 = 0 \) Solving these yields: \( x = \frac{5}{3} \) or \( x = 3 \) However, since \( x = 3 \) would make the original expression undefined (due to division by zero), we discard that solution. The final answer is: \( x = \frac{5}{3} \) or \( x = \square \) (remaining solution is not applicable since \( x=3 \) is invalid). For clarity in completing the solution: \( x = \frac{5}{3} \) or \( x = \square \) (valid answer only is \( \frac{5}{3} \)).

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