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1) It is not a polynomial
As [(x-2)(x-4)]/x = [(x-2)(x-4)] * 1/x
1/x = x^(-1)
It is negative power. So it is not a polynomial
2) It is not a polynomial
1/{(5x)^-2 + 5x^7/7
= 5x^2 +5x^7*(1/7)
1/7 = 7^(-1)
It is negative power. So it is not a polynomial.
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