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If both the roots of a quadratic equation are coincident, which one of the following is not correct?

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Important Questions on Theory of Equations

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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 4
If one root of the equation is reciprocal to the other root, which of the following is correct?
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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 5
If one root of the quadratic equation x2-x-1=0 is α, the other root is
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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 5

Find the solutions of the following equation:
y4-4=0

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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 6

Find the solutions of the following equation:
2x10-x5-4=0

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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 9

Find the solutions of the following equation:
m+2m-3=1

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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 1
If the roots of a quadratic equation are real and rational, which one of the following best describes the value of the discriminant D ?
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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 2
If the roots of a quadratic equation are real and unequal, which one of the following is necessarily true?
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Quantum CAT Also Useful for XAT>Chapter 14 - SNAP>CMAT>Q 3
If the roots of a quadratic equation are unequal, which one of the following cannot be true?