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
Correct Answer

A. (A=B)

Step 1

Concept

Write \(x^2=x+2\) as \(x^2-x-2=0\).

Step 2

Why this answer is correct

((x-2)(x+1)=0), so (x=2) or (x=-1).

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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.

Correct Answer: A. (A=B). Explanation: 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। / Step 1: Write \(x^2=x+2\) as \(x^2-x-2=0\). Step 2: ((x-2)(x+1)=0), so (x=2) or (x=-1). Step 3: The order of solutions does not matter in a set.

Which concept should I revise for this Mathematics MCQ?

Write \(x^2=x+2\) as \(x^2-x-2=0\).

What exam hint can help solve this Mathematics question?

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।