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?
Explanation opens after your attempt
B. \(63\)
Concept
\((8-1)(8+1)=8^2-1^2=64-1=63\). Exam tip: use a nearby perfect square.
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.
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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