यदि \(C={x:x^2=16,\ x\in Z}\) है, तो (C) में कितने अवयव हैं?
If \(C={x:x^2=16,\ x\in Z}\), how many elements are there in (C)?
Explanation opens after your attempt
B. (2)
Concept
The integer solutions of \(x^2=16\) are (x=4) and (x=-4).
Why this answer is correct
Therefore \(C=\{-4,4\}\), so it has two elements.
Exam Tip
In square equations, remember to check both positive and negative values. चरण 1: \(x^2=16\) के पूर्णांक हल (x=4) और (x=-4) हैं। चरण 2: इसलिए समुच्चय \(C=\{-4,4\}\) है और इसमें दो अवयव हैं। चरण 3: वर्ग समीकरण में धन और ऋण दोनों मान जाँचना न भूलें।
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