यदि \(W={x:x\in \mathbb{Z},,x^2=9}\), तो (W) का सूची रूप है?
If \(W={x:x\in \mathbb{Z},,x^2=9}\), what is the roster form of (W)?
Explanation opens after your attempt
C. \(W=\{-3,3\}\)
Concept
From \(x^2=9\), we get \(x=\pm3\).
Why this answer is correct
Both (-3) and (3) are integers.
Exam Tip
For square equations, check both positive and negative roots. चरण 1: \(x^2=9\) से \(x=\pm3\) मिलता है। चरण 2: दोनों (-3) और (3) पूर्णांक हैं। चरण 3: वर्ग समीकरण में धनात्मक और ऋणात्मक दोनों मूल जांचें।
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