What is the derivative of f(x) = x^2 * e^x?

Practice Questions

Q1
What is the derivative of f(x) = x^2 * e^x?
  1. e^x(2x + x^2)
  2. e^x(2x)
  3. e^x(x^2 + 2)
  4. e^x(x^2 + 1)

Questions & Step-by-Step Solutions

What is the derivative of f(x) = x^2 * e^x?
Correct Answer: f'(x) = e^x * (x^2 + 2x)
  • Step 1: Identify the function f(x) = x^2 * e^x. This is a product of two functions: u = x^2 and v = e^x.
  • Step 2: Recall the product rule for derivatives. The product rule states that if you have two functions u and v, then the derivative f'(x) = u'v + uv'.
  • Step 3: Find the derivative of u = x^2. The derivative u' = 2x.
  • Step 4: Find the derivative of v = e^x. The derivative v' = e^x (since the derivative of e^x is e^x).
  • Step 5: Apply the product rule: f'(x) = u'v + uv' = (2x)(e^x) + (x^2)(e^x).
  • Step 6: Factor out e^x from both terms: f'(x) = e^x(2x + x^2).
  • Step 7: Rearrange the terms: f'(x) = e^x(x^2 + 2x).
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