यदि \(A={x\in \mathbb{R}:x^2=x+2}\) और \(B=\{-1,2\}\) है, तो सही विकल्प चुनिए।
If \(A={x\in \mathbb{R}:x^2=x+2}\) and \(B=\{-1,2\}\), choose the correct option.
Explanation opens after your attempt
A. (A=B)
Concept
Write \(x^2=x+2\) as \(x^2-x-2=0\).
Why this answer is correct
((x-2)(x+1)=0), so (x=2) or (x=-1).
Exam Tip
The order of solutions does not matter in a set. चरण 1: \(x^2=x+2\) को \(x^2-x-2=0\) लिखें। चरण 2: ((x-2)(x+1)=0), इसलिए (x=2) या (x=-1)। चरण 3: समुच्चय में हलों का क्रम महत्व नहीं रखता।
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