Question

Find the solution of the equation

\[f(x)=\frac{x+1}{x^3-4x}\]

Answer 1

For the zero's of the polynomial I got 0,-2 and 2 are my intervals

\[(-\infty,-2) U (-2,0) U (0,2) U (2, \infty)\]
Is that suppose to be a smooth bracket or curved?

Answer 2

yes your answer is correct.close interval belonging corner values.
so it's right

Answer 3

Okay, thank you.