Answer: eˣ + C.
- A eˣ + C
- B xeˣ + C
- C eˣ/x + C
- D x + C
Correct answer: A. eˣ + C
Explanation: Integral of eˣ = eˣ + C (exponential function is its own integral).
The exact area under the curve from a to b (shaded) is approximated by a few rectangles, the Riemann sum idea behind the definite integral.