∫Calc Practice

Derivative of \( \displaystyle \left(2 x - 1\right)^{2} e^{1 - 2 x} \)

Problem 2.612 · hard

Differentiate \( \displaystyle f(x) = \left(2 x - 1\right)^{2} e^{1 - 2 x} \).
  1. \[ \frac{d}{d x} \left(2 x - 1\right)^{2} e^{1 - 2 x} \]
    Start with the derivative of the function.✓ Proved
  2. \[ = \left(2 x - 1\right)^{2} \frac{d}{d x} e^{1 - 2 x} + e^{1 - 2 x} \frac{d}{d x} \left(2 x - 1\right)^{2} \]
    productApply the product rule.✓ Proved
  3. \[ = \left(2 x - 1\right)^{2} \frac{d}{d x} e^{1 - 2 x} + \left(4 x - 2\right) e^{1 - 2 x} \frac{d}{d x} \left(2 x - 1\right) \]
    powerDifferentiate the first part using the power rule.✓ Proved
  4. \[ = \left(2 x - 1\right)^{2} \frac{d}{d x} e^{1 - 2 x} + \left(8 x - 4\right) e^{1 - 2 x} \]
    derivative algebraDifferentiate the inner part of the power term. Simplify the first term.✓ Proved
  5. \[ = \left(2 x - 1\right)^{2} e^{1 - 2 x} \frac{d}{d x} \left(1 - 2 x\right) + \left(8 x - 4\right) e^{1 - 2 x} \]
    chainApply the chain rule to the exponential term.✓ Proved
  6. \[ = - 2 \left(2 x - 1\right)^{2} e^{1 - 2 x} + \left(8 x - 4\right) e^{1 - 2 x} \]
    derivative algebraDifferentiate the exponent. Simplify the expression.✓ Proved
  7. \[ = \left(6 - 4 x\right) \left(2 x - 1\right) e^{1 - 2 x} \]
    algebra algebra simplifyFactor out common terms. Distribute the -2 inside the parentheses. Combine like terms.✓ Proved
Answer \( \left(- 8 x^{2} + 16 x - 6\right) e^{1 - 2 x} \)

✓ 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
LineStatusChecked byDetail
1✓ Provedsympy 1.14.0line 1 is the problem as stated
2✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
3✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
4✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
5✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
6✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
7✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
8✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
9✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
10✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
11✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
answer✓ Provedsympy 1.14.0final line against the stated answer: simplify(a - b) reduced to 0
answer, a second way✓ Provedsympy 1.14.0SymPy differentiated f directly and got the stated answer

Reviewers

  • gpt-oss:20b: pass
  • qwen3.6:27b-mlx: pass — The solution correctly applies the product, power, chain, and derivative rules in a logical sequence. Each step changes only one aspect of the expression, and the labels accurately reflect the operations performed.
Every verdict on record (4)
  • qwen3.6:27b-mlx: pass 2026-09-21 — The solution correctly applies the product, power, chain, and derivative rules in a logical sequence. Each step changes only one aspect of the expression, and the labels accurately reflect the operations performed.
  • gpt-oss:20b: pass 2026-09-21
  • qwen3.6:27b-mlx: pass 2026-09-21 — The solution correctly applies the product, power, chain, and derivative rules in a logical sequence. Each step isolates a single transformation, and the labels accurately reflect the operations performed.
  • 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.