f(x) = √(x² - 4) ফাংশনটির ডোমেন কত?

A (∞, 2] ∪ [-2, ∞)

B (-∞, -2] ∪ [2, ∞)

C (-∞, 2] ∪ [-2, ∞)

D (∞, -2] ∪ [2, -∞)

Solution

Correct Answer: Option B

এখানে,
x² - 4 ≥ 0
বা, x² ≥ 4
বা, |x| ≥ 2
বা, x ≤ -2 অথবা x ≥ 2

ডোমেন: x ≤ -2 বা x ≥ 2, অর্থাৎ (-∞, -2] ∪ [2, ∞)

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