Derivative of \( \displaystyle - x + \left(x - \frac{3}{2}\right) \ln{\left(2 x - 3 \right)} \)
Problem 2.1502 · hard Beautiful
Differentiate \( \displaystyle f(x) = - x + \left(x - \frac{3}{2}\right) \ln{\left(2 x - 3 \right)} \).
- \[ \frac{d}{d x} \left(- x + \left(x - \frac{3}{2}\right) \ln{\left(2 x - 3 \right)}\right) \]derivativeStart with the derivative of the function.✓ Proved
- \[ = \frac{d}{d x} \left(- x\right) + \frac{d}{d x} \left(x - \frac{3}{2}\right) \ln{\left(2 x - 3 \right)} \]sumApply the sum rule.✓ Proved
- \[ = \left(x - \frac{3}{2}\right) \frac{d}{d x} \ln{\left(2 x - 3 \right)} + \ln{\left(2 x - 3 \right)} \frac{d}{d x} \left(x - \frac{3}{2}\right) + \frac{d}{d x} \left(- x\right) \]productApply the product rule to the second term.✓ Proved
- \[ = \left(x - \frac{3}{2}\right) \frac{d}{d x} \ln{\left(2 x - 3 \right)} + \left(- \frac{d}{d x} \frac{3}{2} + \frac{d}{d x} x\right) \ln{\left(2 x - 3 \right)} + \frac{d}{d x} \left(- x\right) \]sumDistribute the logarithm over the subtraction.✓ Proved
- \[ = \left(x - \frac{3}{2}\right) \frac{d}{d x} \ln{\left(2 x - 3 \right)} + \ln{\left(2 x - 3 \right)} + \frac{d}{d x} \left(- x\right) \]derivative constantDifferentiate the terms inside the parentheses. Simplify the constant term.✓ Proved
- \[ = \frac{\left(x - \frac{3}{2}\right) \frac{d}{d x} \left(2 x - 3\right)}{2 x - 3} + \ln{\left(2 x - 3 \right)} + \frac{d}{d x} \left(- x\right) \]logarithmicApply the chain rule for the logarithm.✓ Proved
- \[ = \frac{2 \left(x - \frac{3}{2}\right)}{2 x - 3} + \ln{\left(2 x - 3 \right)} + \frac{d}{d x} \left(- x\right) \]chainDifferentiate the inner function 2x - 3.✓ Proved
- \[ = \ln{\left(2 x - 3 \right)} + \frac{d}{d x} \left(- x\right) + 1 \]algebra algebraMultiply the terms in the second part. Simplify the fraction.✓ Proved
- \[ = \ln{\left(2 x - 3 \right)} \]derivative simplifyDifferentiate the first term. Combine the constants.✓ Proved
Answer \( \ln{\left(2 x - 3 \right)} \)
✓ Nihil obstat Every line of this solution was proved by the computer algebra system SymPy. The answer was also checked a second way, without looking at the solution. Reviewers found nothing wrong with the explanation.
The full receipt
| Line | Status | Checked by | Detail |
|---|---|---|---|
| 1 | ✓ Proved | sympy 1.14.0 | line 1 is the problem as stated |
| 2 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 3 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 4 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 5 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 6 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 7 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments undefined where 2*x - 3 = 0 |
| 8 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments undefined where 2*x - 3 = 0 |
| 9 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments undefined where 2*x - 3 = 0 |
| 10 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 11 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 12 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| answer | ✓ Proved | sympy 1.14.0 | final line against the stated answer: simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| answer, a second way | ✓ Proved | sympy 1.14.0 | SymPy differentiated f directly and got the stated answer |
Reviewers
gpt-oss:20b: passqwen3.6:27b-mlx: pass
Every verdict on record (4)
qwen3.6:27b-mlx: pass 2026-10-04gpt-oss:20b: pass 2026-10-04qwen3.6:27b-mlx: pass 2026-10-04gpt-oss:20b: pass 2026-10-04
Proved: SymPy reduced the difference between the two sides to zero. Checked independently: a separate
method, named above, confirmed it. Checked numerically: the two sides agree at every sampled point, which is evidence,
not proof. Reviewed: a model or a person read it; that is all a sentence can have. Solution by
gemma4:26b, checked 2026-10-04 with SymPy 1.14.0.