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If P = -√80, between which two consecutive integers is P located?

Answer and explanation

Correct answer: Between -9 and -8

The governing concept is locating a negative irrational number by first bounding its positive square root between consecutive integers. Since 64 < 80 < 81, taking square roots gives 8 < √80 < 9. When each part of this inequality is multiplied by -1, the inequality signs reverse, producing -9 < -√80 < -8. Therefore P lies strictly between -9 and -8, so option A is correct. Option C gives the interval for the positive number √80 rather than P. Option B places P too close to zero, while option D places it below -9. The sign reversal is essential because negative numbers are ordered oppositely when multiplied by -1.

Related tags

Number-LineNegative-Square-RootInteger-BoundsInequalityRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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