Mathematics I / Antiderivatives and Indefinite Integrals
Practice question · Select all that apply

Select every function whose derivative is 3x^2.

Hints
  1. Differentiate each candidate rather than pattern-matching the shape.
  2. Adding or subtracting a constant does not change a derivative.
Show the answer
  • B. x^3 - 2
  • C. x^3 + 7
  • D. x^3
Why

x3x^{3}, x3+7x^{3}+7 and x32x^{3}-2 all differentiate to 3x23x^{2}, they are members of one vertical family. 3x33x^{3} gives 9x29x^{2} and 9x gives 9. This is the family that + C names.

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