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Question

The roots of the equation x23+x132 = 0 are


A

1,4

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B

1,-4

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C

1,-8

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D

1, 8

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Solution

The correct option is C

1,-8


x23+x132 = 0 ⇒ (x13)2+x132 = 0

let a = x3, then a2+a2 = 0 ⇒ a = 1, -2

Hence x = 1, - 8 (by a = x13).


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