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Choose the correct alternative. (i) Wh...

Choose the correct alternative.
(i) Which of the following is a quadratic equation?

A

`x^2+3x+1=(x-2)^2`

B

`(x+1)^2=5(x-9)`

C

`x^3-1=0`

D

`5x+9=0`

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    D
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    D
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