Level:
Project ID:
1003085505
Accepted:
1
Clonable:
0
Easy:
1
Decide which of the following functions have points of discontinuity.
\[ \begin{aligned}
f_1(x)&=\frac{x-1}{x^2+1} \\
f_2(x)&=\frac{x^2-1}{x+1} \\
f_3(x)&=\frac{3x-1}{x^3+1} \\
f_4(x)&=\frac{x+1}{x^2-x+1}
\end{aligned} \]
The only such functions are:
\( f_2 \), \( f_3 \)
\( f_1 \), \( f_2 \), \( f_3 \)
\( f_2 \), \( f_3 \), \( f_4 \)
\( f_2 \), \( f_4 \)