Derivative of \( \displaystyle 4 x^{2} \ln{\left(2 x \right)} \)
Problem 2.600 · hard
Differentiate \( \displaystyle f(x) = 4 x^{2} \ln{\left(2 x \right)} \).
- \[ \frac{d}{d x} 4 x^{2} \ln{\left(2 x \right)} \]derivativeStart with the derivative of the function.✓ Proved
- \[ = 4 \frac{d}{d x} x^{2} \ln{\left(2 x \right)} \]constant-multiplePull out the constant factor 4.✓ Proved
- \[ = 4 x^{2} \frac{d}{d x} \ln{\left(2 x \right)} + 4 \ln{\left(2 x \right)} \frac{d}{d x} x^{2} \]productApply the product rule.✓ Proved
- \[ = 4 x^{2} \frac{d}{d x} \ln{\left(2 x \right)} + 8 x \ln{\left(2 x \right)} \]powerDifferentiate x**2.✓ Proved
- \[ = 8 x \ln{\left(2 x \right)} + 2 x \frac{d}{d x} 2 x \]chainApply the chain rule to log(2*x).✓ Proved
- \[ = 8 x \ln{\left(2 x \right)} + 4 x \]derivative algebra algebra simplifyDifferentiate 2*x. Simplify the fraction. Simplify x**2/x. Distribute the 4 and simplify.✓ Proved
Answer \( 8 x \log{\left(2 x \right)} + 4 x \)
✓ 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 |
| 8 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 log is undefined for non-positive arguments |
| 9 | ✓ 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 2026-09-21gpt-oss:20b: pass 2026-09-21qwen3.6:27b-mlx: pass 2026-09-21 — The solution correctly applies the differentiation rules in a step-by-step manner, adhering to the single-change constraint and using valid labels from the fixed vocabulary.gpt-oss:20b: pass 2026-09-21
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 2026-09-26 with SymPy 1.14.0.