The solution set of x4-8 x2-9 - 0 is

The correct option is B [ 3, 3]x^4 8x^2 9 ≤ 0 ⇒ (x^2 +1)(x^2 9) ≤ 0 ⇒ (x+3)(x 3) ≤ 0 ∴ x ∈ [ 3, 3] ...

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Inequalities Involving Modulus Function

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Question

The solution set of $x^{4} - 8 x^{2} - 9 \leq 0$ is

(- 3, 3)

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(0, 3)

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[- 3, 3]

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[3, \infty)

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The roots of the equation $x^{4} - 8 x^{2} - 9$ = 0 are

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