UPSKILL MATH PLUS

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Check whether the following are quadratic equations :
 
(i) \((2x – 1)(x – 3) = (x + 5)(x – 1)\)
 
(ii) \(x^2 + 3x + 1 = (x – 2)^2\)
 
(iii) \((x + 2)^3 = 2x (x^2 – 1)\)
 
(iv) \(x^3 – 4x^2 – x + 1 = (x – 2)^3\)
Answer variants:
Quadratic equation
Not a quadratic equation