If √(7 + ∛x) = 4, then value of x is :यदि √(7 + ∛x) = 4 हो, तो x का मान है :

1. A27
2. B729
3. C512
4. D216

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Correct answer: B. 729

Explanation

Squaring: 7 + ∛x = 16, so ∛x = 9 and x = 9³ = 729.दोनों पक्षों का वर्ग करने पर 7 + ∛x = 16, अतः ∛x = 9 और x = 9³ = 729।