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Question

Question 1(vii)

Check whether the following is a quadratic equation:
(vii) (x+2)3=2x(x21)

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Solution

(vii)
(x+2)3=2x(x21)x3+8+6x2+12x=2x32xx36x214x8=0
It is not of the form ax2+bx+c=0
Hence, the given equation is not a quadratic equation.

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