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L.H.S.   and R.H.S  can be written as: i.e.,  This equation is NOT of type: . Here a=0, hence, the given equation is not a quadratic equation.
L.H.S.  can be written as: and R.H.S  can be written as: i.e.,  This equation is of type: . Hence, the given equation is a quadratic equation.
L.H.S.  can be written as: and R.H.S  can be written as: i.e.,  This equation is of type: . Hence, the given equation is a quadratic equation.
L.H.S.  can be written as: and R.H.S  can be written as: i.e.,  The equation is of the type: . Hence, the given equation is not a quadratic equation since a=0.
We have L.H.S.  Therefore,  can be written as: i.e.,  Or  This equation is of type: . Hence, the given equation is a quadratic equation.    
Given equation  can be written as: i.e.,  This equation is of type: . Hence, the given equation is a quadratic equation.  
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