Which of the following are quadratic equations?
`(i) x^(2)-5x+3=0`
(ii) `2x^(2)-3sqrt(2)x+6=0`
(iii) `3x^(2)-2sqrtx+8=0`
(iv) `2x^(2)-3=0`
(v) `x+(1)/(x)=x^(2)`
(vi) `x^(2)+(1)/(x^(2))=4(1)/(4)`

Explanation

To determine which of the given equations are quadratic equations, we need to recall the standard form of a quadratic equation, which is:

\[ Ax^2 + Bx + C = 0 \]

where \( A \), \( B \), and \( C \) are constants, and \( A \neq 0 \).

Now, let's analyze each equation step by step:

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