Which of the following is a quadratic eq...

Which of the following is a quadratic equation?

A

`X^2 + 3x^3 + 5`

B

`x^(3//5) +y^(2)-3`

C

`5x^2 + 4 - 7x`

D

`x^2 - 2x^(1//5)+2`

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