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Question
Which of the following are quadratic equation in x?
`(x+2)^3=x^3-8`
Solution
`(x+2)^3=x^3-8`
`⇒ x^3+6x^2+12x+8=x^3-8`
`⇒6x^2+12x+16=0`
This is of the form `ax^2+bx+c=0`
Hence, the given equation is a quadratic equation.
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