Answer :

Answer: Not a quadratic eqn

Step-by-step explanation: x(x+2)(x^2-1)=-1

x^2+2x(x^2-1)=-1

x^4-X^2+2x^3-2x=-1

x^4-x^2+2x^3-2x+1=0

x^4+2x^3-x^2-2x+1=0

highest degree is 4 so , it is not a quadratic eqn

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