∫Calc Practice

Derivative of \( \displaystyle \sqrt{5} \sqrt{x} e^{5 x} \)

Problem 2.577 · hard

Differentiate \( \displaystyle f(x) = \sqrt{5} \sqrt{x} e^{5 x} \).
  1. \[ \frac{d}{d x} \sqrt{5} \sqrt{x} e^{5 x} \]
    derivativeStart with the derivative of the function.✓ Proved
  2. \[ = \sqrt{5} \frac{d}{d x} \sqrt{x} e^{5 x} \]
    constant-multiplePull out the constant factor.✓ Proved
  3. \[ = \sqrt{5} \left(\sqrt{x} \frac{d}{d x} e^{5 x} + e^{5 x} \frac{d}{d x} \sqrt{x}\right) \]
    productApply the product rule.✓ Proved
  4. \[ = \sqrt{5} \left(\sqrt{x} \frac{d}{d x} e^{5 x} + e^{5 x} \frac{d}{d x} x^{0.5}\right) \]
    rewriteRewrite sqrt(x) as x**0.5.✓ Proved
  5. \[ = \sqrt{5} \left(\frac{0.5 e^{5 x}}{x^{0.5}} + \sqrt{x} \frac{d}{d x} e^{5 x}\right) \]
    derivativeDifferentiate x**0.5.✓ Proved
  6. \[ = \sqrt{5} \left(\frac{0.5 e^{5 x}}{x^{0.5}} + 5 \sqrt{x} e^{5 x}\right) \]
    derivativeDifferentiate exp(5*x) using the chain rule.✓ Proved
  7. \[ = \sqrt{5} \left(\frac{0.5}{x^{0.5}} + 5 \sqrt{x}\right) e^{5 x} \]
    algebraFactor out exp(5*x).✓ Proved
  8. \[ = \sqrt{5} \left(5 \sqrt{x} + \frac{1}{2 \sqrt{x}}\right) e^{5 x} \]
    algebraRewrite 0.5*x**(-0.5) as 1/(2*sqrt(x)).✓ Proved
  9. \[ = \frac{\sqrt{5} \left(10 x + 1\right) e^{5 x}}{2 \sqrt{x}} \]
    simplifyCombine the terms into a single fraction.✓ Proved
Answer \( \frac{\sqrt{5} \left(10 x + 1\right) e^{5 x}}{2 \sqrt{x}} \)

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. The reviewers disagree about how one step is explained; every verdict is in the receipt.

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
undefined where x = 0
6✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
7✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
8✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
9✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
answer✓ Provedsympy 1.14.0final line against the stated answer: simplify(a - b) reduced to 0
undefined where x = 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
Every verdict on record (4)
  • qwen3.6:27b-mlx: pass 2026-09-21
  • gpt-oss:20b: pass 2026-09-21
  • qwen3.6:27b-mlx: fail (misleading) 2026-09-21 — Step 6 is labeled 'derivative' but applies the chain rule to differentiate exp(5*x); the label should be 'chain'. Additionally, the note explicitly mentions the chain rule while the label does not, creating a contradiction that would confuse a student about which label corresponds to which operation.
  • 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.