यदि \(a=\sqrt{7}+\sqrt{2}\) और \(b=\sqrt{7}-\sqrt{2}\) हैं तो (ab) का मान क्या है?

If \(a=\sqrt{7}+\sqrt{2}\) and \(b=\sqrt{7}-\sqrt{2}\), what is the value of (ab)?

Explanation opens after your attempt
Correct Answer

A. (5)

Step 1

Concept

In conjugate multiplication, (ab=7-2=5). The difference of squares formula gives the answer quickly.

Step 2

Why this answer is correct

The correct answer is A. (5). In conjugate multiplication, (ab=7-2=5). The difference of squares formula gives the answer quickly.

Step 3

Exam Tip

संयुग्मी गुणन में (ab=7-2=5) होता है। अंतर वर्ग सूत्र जल्दी उत्तर देता है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a=\sqrt{7}+\sqrt{2}\) और \(b=\sqrt{7}-\sqrt{2}\) हैं तो (ab) का मान क्या है? / If \(a=\sqrt{7}+\sqrt{2}\) and \(b=\sqrt{7}-\sqrt{2}\), what is the value of (ab)?

Correct Answer: A. (5). Explanation: संयुग्मी गुणन में (ab=7-2=5) होता है। अंतर वर्ग सूत्र जल्दी उत्तर देता है। / In conjugate multiplication, (ab=7-2=5). The difference of squares formula gives the answer quickly.

Which concept should I revise for this Mathematics MCQ?

In conjugate multiplication, (ab=7-2=5). The difference of squares formula gives the answer quickly.

What exam hint can help solve this Mathematics question?

संयुग्मी गुणन में (ab=7-2=5) होता है। अंतर वर्ग सूत्र जल्दी उत्तर देता है।