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Check whether the following are quadrati...

Check whether the following are quadratic equations?
(i) `(x+1)^(2)=2(x-3)` (ii) `x^(2)-2x=-2(3-x)`
(iii) `(x-2)(x+1)=(x-1)(x+3)` (iv) `(x-3)(2x+1)=x(x+5)`
(v) `(2x-1)(x-3)=(x+5)(x-1)` (vi) `x^(2)+3x+1=(x-2)^(2)`
(vii) `(x+2)^(3)=2x(x^(2)-1)` (viii) `x^(3)-4x^(2)-x+1=(x-2)^(3)`

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