एक (5y-1) भुजा वाले वर्ग के दृश्य मॉडल में कौन-सा विस्तार सही है?
Which expansion is correct in the visual model of a square with side (5y-1)?
Explanation opens after your attempt
A. \( 25y^2-10y+1 \)
Concept
The middle term is \(-2\cdot5y\cdot1=-10y\). In exams, count the negative sign in both strips.
Why this answer is correct
The correct answer is A. \( 25y^2-10y+1 \). The middle term is \(-2\cdot5y\cdot1=-10y\). In exams, count the negative sign in both strips.
Exam Tip
बीच का पद \(-2\cdot5y\cdot1=-10y\) है। परीक्षा में ऋण चिन्ह को दोनों पट्टियों में गिनें।
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