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How do we write the solution (x<5) in interval form?

Answer and explanation

Correct answer: ((-\infty,5))

The direct answer is A: (-∞,5). The inequality x<5 includes every real number smaller than 5 and excludes 5 itself. In interval notation, the left side continues without end toward negative infinity, written −∞; infinity is never an included endpoint, so it uses a parenthesis. The right endpoint 5 is also excluded because the sign is strict <, so it also uses a parenthesis. Option A is correct. Option B includes 5 with a square bracket, which would mean x≤5. Option C starts at 5 and includes numbers greater than 5, the opposite direction. Option D also represents numbers greater than 5 and excludes 5. Memory cue: x<5 means shade left of 5 and leave 5 open.

Related tags

Linear-InequalitiesInterval-NotationClass-11Easy

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