एक दृश्य मॉडल में ((x+3)2) से ((x-3)2) घटाया गया। यदि इसे पट्टियों में देखें तो कितनी (3x) पट्टियां बचेंगी?
In a visual model, ((x-3)2) is subtracted from ((x+3)2). If seen as strips, how many (3x) strips remain?
Explanation opens after your attempt
C. (4)four strips
Concept
The area difference is (12x), equal to four (3x) strips. In exams think of four equal strips in the difference of symmetric squares.
Why this answer is correct
The correct answer is C. (4) / four strips. The area difference is (12x), equal to four (3x) strips. In exams think of four equal strips in the difference of symmetric squares.
Exam Tip
क्षेत्रफल अंतर (12x) है जो चार (3x) पट्टियों के बराबर है। परीक्षा में सममित वर्गों के अंतर में चार समान पट्टियां सोचें।
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