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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)  \((x – 3)(2x +1) = x(x + 5)\)
Answer variants:
Quadratic equation
Not a quadratic equation