Mathematics

• $\int x\cdot e^{x}dx$

  You wrote $\frac{x^2}{2}{e}^x$. Marked wrong, no explanation.

  39 concepts beneath · deepest gr 04

• Differentiate $f(x)=\frac{3x+1}{x-2}$

  You differentiated the top and the bottom separately.

  28 concepts beneath · deepest gr 04

• Simplify $\frac{x^2+3x}{x+3}$

  You cancelled the x and the 3 and got x + x.

  16 concepts beneath · deepest gr 04

Computer science

• def total(n): if n == 0: return 0 total(n - 1) + n

  Returns None for every input. You cannot see why.

  19 concepts beneath · deepest gr 06

• def bump(x): x = x + 1 n = 5 bump(n) print(n)

  You expected 6. It printed 5.

  10 concepts beneath · deepest gr 06