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(iii)
5+xy is a trinomial

(iii) $5+x y$ is a trinomial

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Factor sums and differences of cubes

Full solution

Q. (iii)

5+x y

is a trinomial

Check definition of trinomial: Check the definition of a trinomial. A trinomial is a polynomial with three terms.
Count terms in $5+xy$ : Count the number of terms in $5+xy$ . There are two terms: $5$ and $xy$ .
Compare with trinomial definition: Compare the number of terms to the definition of a trinomial. Since there are only two terms, $5+xy$ is not a trinomial.

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