Which of the following is a binomial?
(a) $x^{2}+x+3$
(b) $x^{2}+4$
(c) $2 x^{2}$
(d) $x+3+\frac{1}{x}$
Clearly, $x^{2}+4$ is an expression having two non-zero terms. So, it is a binomial.
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