Prove that x 2 + kx + 2 = 0 has real roots if k 2

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Prove that x² + kx + 2 = 0 has real roots if k ≥ 2 √2. For which other values of k does the equation have real roots?

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Cambridge International AS And A Level Mathematics Pure Mathematics 1 Coursebook

ISBN: 9781108407144

1st Edition

Authors: Sue Pemberton, Julian Gilbey

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Question Posted: Mar 09, 2023 05:44 AM

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Prove that x 2 + kx + 2 = 0 has real roots if k 2

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We can use the discriminant of the quadratic equation to determine whether it has real ro...View the full answer

Cambridge International AS And A Level Mathematics Pure Mathematics 1 Coursebook

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