Which of the following options gives all the real roots of the equation $x^{4} - 11 x^{2} + 28 = 0$ ?

- \sqrt 7 and \sqrt 7

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2 and \sqrt 7

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- 4, - \sqrt 7, \sqrt{7} and 4

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- \sqrt 7, - 2, 2 and \sqrt{7}

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Solution

The correct option is D $- \sqrt 7, - 2, 2 and \sqrt{7}$

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