आयाम (a+3) और (a+7) वाले आयत का क्षेत्र मॉडल कौन सा विस्तार देता है?
Which expansion is given by the area model of a rectangle with dimensions (a+3) and (a+7)?
Explanation opens after your attempt
C. \(a^2+10a+21\)
Concept
The four parts are \(a^2\), (7a), (3a), and (21). Exam tip: check the sum and product of the outside numbers.
Why this answer is correct
The correct answer is C. \(a^2+10a+21\). The four parts are \(a^2\), (7a), (3a), and (21). Exam tip: check the sum and product of the outside numbers.
Exam Tip
चार भाग \(a^2\), (7a), (3a) और (21) हैं। परीक्षा में बाहरी संख्याओं का योग और गुणनफल देखें।
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