Question about irreducible polynomials in algebraically closed fields

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A tipical question in the past exams of a commutative algebra course is to determine if a ring of the form $k[x_1,\dots,x_n]/f(x_1,\dots,x_n)$ is an integral domain, usually with $1\le n \le 3$. Suppose that $k$ is algebraically closed and $n=2$ or $3$ to begin. How should I approach this type of problems? What tools of algebraic geometry/commutative algebra should I use?