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

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

A

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

B

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

C

(c) `x^3-1=0`

D

(d) `5x+9=0`

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