एक आयत की लंबाई (r+6) और चौड़ाई (r+2) है। क्षेत्रफल मॉडल से कौन-सा विस्तार मिलता है?
A rectangle has length (r+6) and breadth (r+2). Which expansion is obtained from the area model?
Explanation opens after your attempt
A. \( r^2+8r+12 \)
Concept
The rectangle parts are \(r^2\), (6r), (2r) and (12). In exams, combine (6r+2r) as (8r).
Why this answer is correct
The correct answer is A. \( r^2+8r+12 \). The rectangle parts are \(r^2\), (6r), (2r) and (12). In exams, combine (6r+2r) as (8r).
Exam Tip
आयत के भाग \(r^2\), (6r), (2r) और (12) हैं। परीक्षा में (6r+2r) को (8r) करें।
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