यदि \(7 \times 9\) को दृश्य मॉडल में \((8-1)(8+1)\) की तरह देखें तो मान क्या होगा?

If \(7 \times 9\) is viewed as \((8-1)(8+1)\) in a visual model, what is its value?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. \(63\)

Step 1

Concept

\((8-1)(8+1)=8^2-1^2=64-1=63\). Exam tip: use a nearby perfect square.

Step 2

Why this answer is correct

The correct answer is B. \(63\). \((8-1)(8+1)=8^2-1^2=64-1=63\). Exam tip: use a nearby perfect square.

Step 3

Exam Tip

\((8-1)(8+1)=8^2-1^2=64-1=63\) है। परीक्षा में पास के पूर्ण वर्ग का उपयोग करें।

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यदि \(7 \times 9\) को दृश्य मॉडल में \((8-1)(8+1)\) की तरह देखें तो मान क्या होगा? / If \(7 \times 9\) is viewed as \((8-1)(8+1)\) in a visual model, what is its value?

Correct Answer: B. \(63\). Explanation: \((8-1)(8+1)=8^2-1^2=64-1=63\) है। परीक्षा में पास के पूर्ण वर्ग का उपयोग करें। / \((8-1)(8+1)=8^2-1^2=64-1=63\). Exam tip: use a nearby perfect square.

Which concept should I revise for this Mathematics MCQ?

\((8-1)(8+1)=8^2-1^2=64-1=63\). Exam tip: use a nearby perfect square.

What exam hint can help solve this Mathematics question?

\((8-1)(8+1)=8^2-1^2=64-1=63\) है। परीक्षा में पास के पूर्ण वर्ग का उपयोग करें।