 Hi, welcome to the session. I am Deepika here. Let's discuss a question. Check whether the following is a quadratic equation. x plus 2 whole cube is equal to 2x into x square minus 1. Let's start the solution. Our given equation is x plus 2 cube is equal to 2x into x square minus 1. This implies open this bracket as a whole cube. We know that a plus b cube is equal to a cube that is x cube plus 3a square b that is plus 6x square plus 3ab square that is 12x plus b cube that is 2 cube is equal to a. This is equal to twice x cube minus 2x. This can be rewritten in the form x cube minus 2x cube plus 6x square plus 12x plus 2x plus 8 is equal to 0. When we will solve this we get minus x cube plus 6x square plus 14x plus 8 is equal to 0. Note that given equation is of degree 3. So our answer is no. It is not a quadratic equation because for a quadratic equation we need the highest power of x as 2. So this is our answer. I hope the question is clear to you. Bye and have a good day.