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Question

Find the value of x if x2−4(x|+3=0


A

1

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B

-1

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C

3

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D

-3

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Solution

The correct options are
A

1


B

-1


C

3


D

-3


x2−4(x|+3=0 or (x2∣∣−4(x|+3=0

[we will consider it as quadratic in |x|]

(|x| - 3) (|x| - 1) = 0

⇒ |x| = 3 or |x| = 1
x=±3 or x=±1


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