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Question

Which of the following expressions are not polynomials?
(i) x2 + 2x−2
(ii) ax+x2-x3
(iii) 3y35y + 9
(iv) ax1/2 + ax + 9x2 + 4
(v) 3x−2 + 2x−1 + 4x +5

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Solution

(i) x2+2x-2 is not a polynomial because -2 is the power of variable x is not a non negative integer.(ii) ax+x2-x3 is not a polynomial because 12 is the power of variable x is not a non negative integer.(iii) 3y3-5y+9 is a polynomial because the powers of variable y are non negative integers.(iv) ax12+ax+9x2+4 is not a polynomial because 12 is the power of variable x is not a non negative integer.(v) 3x-2+2x-1+4x+5 is not a polynomial because -2 and -1 are the powers of variable x are not non negative integers.

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