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Question

Which among the following options is not a polynomial?

A
2x3+4x3
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B
5x8+8x5
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C
7x9+9x78
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D
6x4+4x6
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Solution

The correct option is C 7x9+9x78
Concept–––––––:
Exponent of a polynomial should be a whole number.

Method–––––––:
7x9+9x78 contains negative power in its 2nd term. Degree is always a whole number.
This expression fails to become a polynomial.

In contrast, every other expression contains whole number exponent in them and therefore passes to become a polynomial except the expression in option 'c'.

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