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If \(-\sqrt{82}<x<-9\) on the number line, which value is possible?

Answer and explanation

Correct answer: \(-9.03\)

The governing concept is the order of negative real numbers and the reversal caused when a positive square root is multiplied by −1. Since 9²=81 and 10²=100, we know that 9<√82<10. A closer estimate is √82≈9.055, so −√82≈−9.055. Therefore x must lie strictly between −9.055 and −9. The proposed value −9.03 lies in this interval because −9.055<−9.03<−9, so it satisfies both strict inequalities. The value −9.20 is smaller than −9.055, −8.90 is greater than −9, and −10 is also below the permitted interval. Hence option A is the only possible value.

Related tags

Number-LineInequalityNegative-Square-RootRepresenting-Real-NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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