Which of the following expressions are polynomials. If not give reason `:`
`x^(2) ( x-1)`

Which of the following expression are polynomials x-7

Which of the following expressions are polynomials. If not give reason : (1)/(x^(-2))+(1)/(x^(-1))+7

Which of the following expressions are polynomials. If not give reason : (1)/(x) ( x+ 5)

Which of the following expressions are polynomials. If not give reason : (1)/(x^(2))+3x-4

Which of the following expressions are polynomials. If not give reason : sqrt(5)x^(2) + sqrt(3) x + sqrt(2)

Which of the following expression are polynomials x+7/x+1