यदि \(A={x \in \mathbb{R}:x^2-4=0}\), तो (A) किसके समान है?
If \(A={x \in \mathbb{R}:x^2-4=0}\), which set is equal to (A)?
Explanation opens after your attempt
A. ({-2,2})
Concept
From \(x^2-4=0\), we get \(x^2=4\).
Why this answer is correct
The real solutions are (x=-2) and (x=2).
Exam Tip
Hence \(A=\{-2,2\}\). चरण 1: \(x^2-4=0\) से \(x^2=4\) मिलता है। चरण 2: वास्तविक हल (x=-2) और (x=2) हैं। चरण 3: इसलिए \(A=\{-2,2\}\)।
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