यदि (z-7) भुजा वाले वर्ग का दृश्य मॉडल बनाया जाए तो विस्तार क्या होगा?
If a visual model is made for a square of side (z-7), what will be the expansion?
Explanation opens after your attempt
B. \( z^2-14z+49 \)
Concept
In ((z-7)2), the middle term is \(-2\cdot z\cdot7\). In exams, count the two removed strips.
Why this answer is correct
The correct answer is B. \( z^2-14z+49 \). In ((z-7)2), the middle term is \(-2\cdot z\cdot7\). In exams, count the two removed strips.
Exam Tip
((z-7)2) में बीच का पद \(-2\cdot z\cdot7\) होता है। परीक्षा में दो हटाई गई पट्टियों को गिनें।
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