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B
x−x−1
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C
6y+4y−3+2
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Solution
The correct option is Ax2−2x+3 Polynomials cannot have variables with exponents as negative numbers. So, x−x−1 and 6y+4y−3+2 are not polynomials as the variable 'x' and 'y' has negative exponents. Hence, x2−2x+3 is a polynomial expression.