Which of the following is a polynomial?

a. x²+(5√x)+7 b. (1/x³)+7c. 3x²+7 d. √x-1

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# Which of the following is a polynomial?
a. x²+(5√x)+7 b. (1/x³)+7c. 3x²+7 d. √x-1

Which of the following is a polynomial?

a. x²+(5√x)+7 b. (1/x³)+7c. 3x²+7 d. √x-1