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Which interval is correct on the number line for x² < 9?

Answer and explanation

Correct answer: (−3, 3)

Since 9 = 3², the inequality x² < 9 becomes x² < 3². For real numbers, this is equivalent to |x| < 3, which means −3 < x < 3. Every number strictly inside this interval has a square less than 9. The endpoints must be excluded: when x = −3 or x = 3, x² = 9, and equality does not satisfy the strict sign <. On a number line, both endpoints are therefore shown with open circles, with the segment between them selected. Values outside the interval have absolute value greater than 3 and square greater than 9. Thus option A, (−3, 3), is correct; option B incorrectly includes both endpoints.

Related tags

Linear InequalitiesQuadratic InequalityNumber LineInterval NotationClass 11 MathematicsRepresentation On Number LineMathematicsClass 11 Mcq

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